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[Bug 1938023] [NEW] Cannot delete vlan type network via network generic switch (ngs)

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Public bug reported:

User cannot delete vlan type network via network generic switch:

how to reproduce:
1.Create network - works fine - NGS is able to create vlans on switch
openstack network create test-network

2.Delete network - Is not failing via CLI - however goes too quickly - error log in neutron-server (pasted below) 
openstack network delete test-network

neutron stable/victoria - It seems that something had changed in neutron
between those two versions (the same NGS version):

working neutron version:
$ pip list | grep -E "neutron|generic-switch"
networking-generic-switch 4.0.1.dev3
neutron                   17.1.2.dev36
neutron-dynamic-routing   17.0.1.dev3
neutron-fwaas             16.0.0
neutron-lib               2.6.1
neutron-vpnaas            17.0.1.dev4
python-neutronclient      7.2.1


not working neutron version:
$ pip list | grep -E "neutron|generic-switch"
networking-generic-switch 4.0.1.dev3
neutron                   17.2.1.dev4
neutron-dynamic-routing   17.0.1.dev3
neutron-fwaas             16.0.0
neutron-lib               2.6.1
neutron-vpnaas            17.0.1.dev4
python-neutronclient      7.2.1


error:
2021-07-26 09:23:05.274 25 DEBUG neutron.db.ovn_revision_numbers_db [req-80f2ecdb-2321-4d36-8f9c-886e9ff03967 d01eab5bbeb54381aee11cc57b44b45b 2eb2193c72574662945d7a0a60212413 - default default] delete_revision(b23a36b9-1906-4494-bb56-b3a7525c39bb) delete_revision /var/lib/kolla/venv/lib/python3.6/site-packages/neutron/db/ovn_revision_numbers_db.py:118
2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers [req-80f2ecdb-2321-4d36-8f9c-886e9ff03967 d01eab5bbeb54381aee11cc57b44b45b 2eb2193c72574662945d7a0a60212413 - default default] Mechanism driver 'genericswitch' failed in delete_network_postcommit: KeyError: 'provider:network_type'
2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers Traceback (most recent call last):
2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers   File "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/plugins/ml2/managers.py", line 477, in _call_on_drivers
2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers     getattr(driver.obj, method_name)(context)
2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers   File "/var/lib/kolla/venv/lib/python3.6/site-packages/networking_generic_switch/generic_switch_mech.py", line 164, in delete_network_postcommit
2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers     provider_type = network['provider:network_type']
2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers KeyError: 'provider:network_type'
2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers
2021-07-26 09:23:05.294 25 ERROR neutron.plugins.ml2.plugin [req-80f2ecdb-2321-4d36-8f9c-886e9ff03967 d01eab5bbeb54381aee11cc57b44b45b 2eb2193c72574662945d7a0a60212413 - default default] mechanism_manager.delete_network_postcommit failed: neutron.plugins.ml2.common.exceptions.MechanismDriverError

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1938023

Title:
  Cannot delete vlan type network via network generic switch (ngs)

Status in neutron:
  New

Bug description:
  User cannot delete vlan type network via network generic switch:

  how to reproduce:
  1.Create network - works fine - NGS is able to create vlans on switch
  openstack network create test-network

  2.Delete network - Is not failing via CLI - however goes too quickly - error log in neutron-server (pasted below) 
  openstack network delete test-network

  neutron stable/victoria - It seems that something had changed in
  neutron between those two versions (the same NGS version):

  working neutron version:
  $ pip list | grep -E "neutron|generic-switch"
  networking-generic-switch 4.0.1.dev3
  neutron                   17.1.2.dev36
  neutron-dynamic-routing   17.0.1.dev3
  neutron-fwaas             16.0.0
  neutron-lib               2.6.1
  neutron-vpnaas            17.0.1.dev4
  python-neutronclient      7.2.1

  
  not working neutron version:
  $ pip list | grep -E "neutron|generic-switch"
  networking-generic-switch 4.0.1.dev3
  neutron                   17.2.1.dev4
  neutron-dynamic-routing   17.0.1.dev3
  neutron-fwaas             16.0.0
  neutron-lib               2.6.1
  neutron-vpnaas            17.0.1.dev4
  python-neutronclient      7.2.1

  
  error:
  2021-07-26 09:23:05.274 25 DEBUG neutron.db.ovn_revision_numbers_db [req-80f2ecdb-2321-4d36-8f9c-886e9ff03967 d01eab5bbeb54381aee11cc57b44b45b 2eb2193c72574662945d7a0a60212413 - default default] delete_revision(b23a36b9-1906-4494-bb56-b3a7525c39bb) delete_revision /var/lib/kolla/venv/lib/python3.6/site-packages/neutron/db/ovn_revision_numbers_db.py:118
  2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers [req-80f2ecdb-2321-4d36-8f9c-886e9ff03967 d01eab5bbeb54381aee11cc57b44b45b 2eb2193c72574662945d7a0a60212413 - default default] Mechanism driver 'genericswitch' failed in delete_network_postcommit: KeyError: 'provider:network_type'
  2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers Traceback (most recent call last):
  2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers   File "/var/lib/kolla/venv/lib/python3.6/site-packages/neutron/plugins/ml2/managers.py", line 477, in _call_on_drivers
  2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers     getattr(driver.obj, method_name)(context)
  2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers   File "/var/lib/kolla/venv/lib/python3.6/site-packages/networking_generic_switch/generic_switch_mech.py", line 164, in delete_network_postcommit
  2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers     provider_type = network['provider:network_type']
  2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers KeyError: 'provider:network_type'
  2021-07-26 09:23:05.293 25 ERROR neutron.plugins.ml2.managers
  2021-07-26 09:23:05.294 25 ERROR neutron.plugins.ml2.plugin [req-80f2ecdb-2321-4d36-8f9c-886e9ff03967 d01eab5bbeb54381aee11cc57b44b45b 2eb2193c72574662945d7a0a60212413 - default default] mechanism_manager.delete_network_postcommit failed: neutron.plugins.ml2.common.exceptions.MechanismDriverError

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