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[Bug 1811670] [NEW] Instance in anti-affinity group migrate from host1 to host2 success, then migrate back failed

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Public bug reported:

Description
===========
Create an instance in anti-affinity group, then migrate this instance from one host to another success, but migrate back failed.

Steps to reproduce
==================
1. create anti-affinity group
+--------------------------------------+---------------+----------------------------------+----------------------------------+--------------------+---------+----------+
| Id                                   | Name          | Project Id                       | User Id                          | Policies           | Members | Metadata |
+--------------------------------------+---------------+----------------------------------+----------------------------------+--------------------+---------+----------+
| 2f9cb321-c62a-4d1c-a8b0-b23748801db5 | anti-affinity | 1f150042e3c34005a25332f7bcf575c3 | 280cf20a856a4da699a56f91777568bc | [u'anti-affinity'] | []      | {}       |
+--------------------------------------+---------------+----------------------------------+----------------------------------+--------------------+---------+----------+

2. create an instance in this group
nova boot --flavor 1 --image 480fc701-06b2-451e-baf2-2dec4a0799e6 --nic net-id=4ff1fbc3-b69d-44c6-bedd-16c3c55eadc2 --hint group=2f9cb321-c62a-4d1c-a8b0-b23748801db5 test-anti

3. migrate this instance success
nova migrate 974b3da6-25ca-4169-b708-329c9ab0457e

4. migrate again failed
nova migrate 974b3da6-25ca-4169-b708-329c9ab0457e
ERROR (BadRequest): No valid host was found. No valid host found for cold migrate (HTTP 400) (Request-ID: req-3fc9fa7a-cdcf-4a25-b249-6f8388f20bbc)

5. only have two compute_nodes.
nova hypervisor-list
+--------------------------------------+---------------------+-------+---------+
| ID                                   | Hypervisor hostname | State | Status  |
+--------------------------------------+---------------------+-------+---------+
| 4134c729-e9e5-441c-a72d-42efa8a39001 | host-10-43-203-85   | up    | enabled |
| cade3580-8221-4cd1-bcb3-23c62142c469 | host-10-43-202-88   | up    | enabled |
+--------------------------------------+---------------------+-------+---------+


Expected result
===============
migrate success because this anti-affinity group without other instance.

Actual result
=============
migrate failed in second times.

Environment
===========
1. Exact version of OpenStack you are running. See the following
  Pike

2. Which hypervisor did you use?
   Libvirt + KVM

3. Which networking type did you use?
   Neutron with OpenVSwitch

Logs & Configs
==============
1. nova-scheduler
2019-01-14 19:23:23.555 18615 INFO nova.filters [req-3fc9fa7a-cdcf-4a25-b249-6f8388f20bbc 280cf20a856a4da699a56f91777568bc 1f150042e3c34005a25332f7bcf575c3 - default default] Filtering removed all hosts for the request with instance ID '974b3da6-25ca-4169-b708-329c9ab0457e'. Filter results: ['RetryFilter: (start: 1, end: 1)', 'AvailabilityZoneFilter: (start: 1, end: 1)', 'ComputeFilter: (start: 1, end: 1)', 'ComputeCapabilitiesFilter: (start: 1, end: 1)', 'ImagePropertiesFilter: (start: 1, end: 1)', 'PciPassthroughFilter: (start: 1, end: 1)', 'AggregateCoreFilter: (start: 1, end: 1)', 'AggregateRamFilter: (start: 1, end: 1)', 'AggregateMultiTenancyIsolation: (start: 1, end: 1)', 'NetworkFilter: (start: 1, end: 1)', 'HostOccupiedFilter: (start: 1, end: 1)', 'RamFilter: (start: 1, end: 1)', 'CoreFilter: (start: 1, end: 1)', 'ServerGroupAntiAffinityFilter: (start: 1, end: 0)']


2. request_spec's value changed when first migrate success
update source compute_node in request-spec's server_group_hosts when first migrate success.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1811670

Title:
  Instance in anti-affinity group migrate from host1 to host2 success,
  then migrate back failed

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  Create an instance in anti-affinity group, then migrate this instance from one host to another success, but migrate back failed.

  Steps to reproduce
  ==================
  1. create anti-affinity group
  +--------------------------------------+---------------+----------------------------------+----------------------------------+--------------------+---------+----------+
  | Id                                   | Name          | Project Id                       | User Id                          | Policies           | Members | Metadata |
  +--------------------------------------+---------------+----------------------------------+----------------------------------+--------------------+---------+----------+
  | 2f9cb321-c62a-4d1c-a8b0-b23748801db5 | anti-affinity | 1f150042e3c34005a25332f7bcf575c3 | 280cf20a856a4da699a56f91777568bc | [u'anti-affinity'] | []      | {}       |
  +--------------------------------------+---------------+----------------------------------+----------------------------------+--------------------+---------+----------+

  2. create an instance in this group
  nova boot --flavor 1 --image 480fc701-06b2-451e-baf2-2dec4a0799e6 --nic net-id=4ff1fbc3-b69d-44c6-bedd-16c3c55eadc2 --hint group=2f9cb321-c62a-4d1c-a8b0-b23748801db5 test-anti

  3. migrate this instance success
  nova migrate 974b3da6-25ca-4169-b708-329c9ab0457e

  4. migrate again failed
  nova migrate 974b3da6-25ca-4169-b708-329c9ab0457e
  ERROR (BadRequest): No valid host was found. No valid host found for cold migrate (HTTP 400) (Request-ID: req-3fc9fa7a-cdcf-4a25-b249-6f8388f20bbc)

  5. only have two compute_nodes.
  nova hypervisor-list
  +--------------------------------------+---------------------+-------+---------+
  | ID                                   | Hypervisor hostname | State | Status  |
  +--------------------------------------+---------------------+-------+---------+
  | 4134c729-e9e5-441c-a72d-42efa8a39001 | host-10-43-203-85   | up    | enabled |
  | cade3580-8221-4cd1-bcb3-23c62142c469 | host-10-43-202-88   | up    | enabled |
  +--------------------------------------+---------------------+-------+---------+

  
  Expected result
  ===============
  migrate success because this anti-affinity group without other instance.

  Actual result
  =============
  migrate failed in second times.

  Environment
  ===========
  1. Exact version of OpenStack you are running. See the following
    Pike

  2. Which hypervisor did you use?
     Libvirt + KVM

  3. Which networking type did you use?
     Neutron with OpenVSwitch

  Logs & Configs
  ==============
  1. nova-scheduler
  2019-01-14 19:23:23.555 18615 INFO nova.filters [req-3fc9fa7a-cdcf-4a25-b249-6f8388f20bbc 280cf20a856a4da699a56f91777568bc 1f150042e3c34005a25332f7bcf575c3 - default default] Filtering removed all hosts for the request with instance ID '974b3da6-25ca-4169-b708-329c9ab0457e'. Filter results: ['RetryFilter: (start: 1, end: 1)', 'AvailabilityZoneFilter: (start: 1, end: 1)', 'ComputeFilter: (start: 1, end: 1)', 'ComputeCapabilitiesFilter: (start: 1, end: 1)', 'ImagePropertiesFilter: (start: 1, end: 1)', 'PciPassthroughFilter: (start: 1, end: 1)', 'AggregateCoreFilter: (start: 1, end: 1)', 'AggregateRamFilter: (start: 1, end: 1)', 'AggregateMultiTenancyIsolation: (start: 1, end: 1)', 'NetworkFilter: (start: 1, end: 1)', 'HostOccupiedFilter: (start: 1, end: 1)', 'RamFilter: (start: 1, end: 1)', 'CoreFilter: (start: 1, end: 1)', 'ServerGroupAntiAffinityFilter: (start: 1, end: 0)']

  
  2. request_spec's value changed when first migrate success
  update source compute_node in request-spec's server_group_hosts when first migrate success.

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