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[Bug 1477190] [NEW] dhcp._release_lease shouldn't stacktrace when a device isn't found since it could be legitimately gone

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Public bug reported:

http://logs.openstack.org/80/200380/3/gate/gate-tempest-dsvm-neutron-
full/2b49b0d/logs/screen-q-dhcp.txt.gz?level=TRACE#_2015-07-22_09_30_43_303

This kind of stuff is really annoying in debugging failures in the gate
since I think it's a known failure during cleanup of ports when deleting
an instance, so we shouldn't stacktrace this and log as an error, just
handle it in the code and move on.

2015-07-22 09:30:43.303 ERROR neutron.agent.dhcp.agent [req-c7faddea-956c-4544-8ec0-1f6e5029cae1 tempest-NetworksTestDHCPv6-1951433064 tempest-NetworksTestDHCPv6-996832218] Unable to reload_allocations dhcp for 301ef35d-2482-4a13-a088-f456958e878a.
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Traceback (most recent call last):
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/dhcp/agent.py", line 115, in call_driver
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     getattr(driver, action)(**action_kwargs)
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 432, in reload_allocations
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     self._release_unused_leases()
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 671, in _release_unused_leases
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     self._release_lease(mac, ip, client_id)
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 415, in _release_lease
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     ip_wrapper.netns.execute(cmd, run_as_root=True)
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/ip_lib.py", line 701, in execute
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     extra_ok_codes=extra_ok_codes, **kwargs)
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/utils.py", line 138, in execute
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     raise RuntimeError(m)
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent RuntimeError: 
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Command: ['ip', 'netns', 'exec', u'qdhcp-301ef35d-2482-4a13-a088-f456958e878a', 'dhcp_release', 'tapcb2fa9dc-f6', '2003::e6ef:eb57:47b4:91cf', 'fa:16:3e:18:e6:78']
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Exit code: 1
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Stdin: 
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Stdout: 
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Stderr: cannot setup interface: No such device
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent 
2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent 


http://logstash.openstack.org/#eyJzZWFyY2giOiJtZXNzYWdlOlwiU3RkZXJyOiBjYW5ub3Qgc2V0dXAgaW50ZXJmYWNlOiBObyBzdWNoIGRldmljZVwiIEFORCB0YWdzOlwic2NyZWVuLXEtZGhjcC50eHRcIiIsImZpZWxkcyI6W10sIm9mZnNldCI6MCwidGltZWZyYW1lIjoiNjA0ODAwIiwiZ3JhcGhtb2RlIjoiY291bnQiLCJ0aW1lIjp7InVzZXJfaW50ZXJ2YWwiOjB9LCJzdGFtcCI6MTQzNzU3NjE3ODQzNn0=

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1477190

Title:
  dhcp._release_lease shouldn't stacktrace when a device isn't found
  since it could be legitimately gone

Status in neutron:
  New

Bug description:
  http://logs.openstack.org/80/200380/3/gate/gate-tempest-dsvm-neutron-
  full/2b49b0d/logs/screen-q-dhcp.txt.gz?level=TRACE#_2015-07-22_09_30_43_303

  This kind of stuff is really annoying in debugging failures in the
  gate since I think it's a known failure during cleanup of ports when
  deleting an instance, so we shouldn't stacktrace this and log as an
  error, just handle it in the code and move on.

  2015-07-22 09:30:43.303 ERROR neutron.agent.dhcp.agent [req-c7faddea-956c-4544-8ec0-1f6e5029cae1 tempest-NetworksTestDHCPv6-1951433064 tempest-NetworksTestDHCPv6-996832218] Unable to reload_allocations dhcp for 301ef35d-2482-4a13-a088-f456958e878a.
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Traceback (most recent call last):
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/dhcp/agent.py", line 115, in call_driver
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     getattr(driver, action)(**action_kwargs)
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 432, in reload_allocations
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     self._release_unused_leases()
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 671, in _release_unused_leases
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     self._release_lease(mac, ip, client_id)
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/dhcp.py", line 415, in _release_lease
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     ip_wrapper.netns.execute(cmd, run_as_root=True)
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/ip_lib.py", line 701, in execute
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     extra_ok_codes=extra_ok_codes, **kwargs)
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent   File "/opt/stack/new/neutron/neutron/agent/linux/utils.py", line 138, in execute
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent     raise RuntimeError(m)
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent RuntimeError: 
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Command: ['ip', 'netns', 'exec', u'qdhcp-301ef35d-2482-4a13-a088-f456958e878a', 'dhcp_release', 'tapcb2fa9dc-f6', '2003::e6ef:eb57:47b4:91cf', 'fa:16:3e:18:e6:78']
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Exit code: 1
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Stdin: 
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Stdout: 
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent Stderr: cannot setup interface: No such device
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent 
  2015-07-22 09:30:43.303 8230 ERROR neutron.agent.dhcp.agent 

  
  http://logstash.openstack.org/#eyJzZWFyY2giOiJtZXNzYWdlOlwiU3RkZXJyOiBjYW5ub3Qgc2V0dXAgaW50ZXJmYWNlOiBObyBzdWNoIGRldmljZVwiIEFORCB0YWdzOlwic2NyZWVuLXEtZGhjcC50eHRcIiIsImZpZWxkcyI6W10sIm9mZnNldCI6MCwidGltZWZyYW1lIjoiNjA0ODAwIiwiZ3JhcGhtb2RlIjoiY291bnQiLCJ0aW1lIjp7InVzZXJfaW50ZXJ2YWwiOjB9LCJzdGFtcCI6MTQzNzU3NjE3ODQzNn0=

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