[#NETVIRT-1019] CSIT Sporadic failures - port leak in tempest suite

Some ports are not cleaned up during our tempest suite and the suite teardown
is unable to delete the external network which has these left over ports.

Functionally, I think all the tempest test cases are passing for the most
part. We are only catching this because of our suite teardown which is
failing to clean up. This is probably one of our resource leaks others
have found from time to time.

I can't find the smoking gun, and it could be coming from multiple tempest
test cases, but I think we are getting left overs even from the tempest.api.network
group of tests. Now that we are collecting debug logs at the teardown()
portion of each tempest.scenario test we can see a list of the ports that
exist. If we compare a passing job [0] we can see there are less ports
from the failing job [1] in the first case after tempest.api.network. Then
you can see at the very end of those jobs that our passing case only has 4
ports in use (I'm assuming those are the ports being used by that one last
tempest scenario case). But, in the failing job, you can see 10 ports are
still in there, so proabably we've leaked 6 ports at that point.

2017-11-20 10:14:20.192 16601 DEBUG neutron.plugins.ml2.managers [req-0e73cc7b-709c-422d-a3cd-50e84233e2fc - -] DB exception raised by Mechanism driver 'opendaylight_v2' in update_port_precommit _call_on_drivers /opt/stack/neutron/neutron/plugins/ml2/managers.py:433
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers Traceback (most recent call last):
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers   File /opt/stack/neutron/neutron/plugins/ml2/managers.py, line 426, in _call_on_drivers
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers     getattr(driver.obj, method_name)(context)
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers   File /usr/lib/python2.7/site-packages/oslo_log/helpers.py, line 67, in wrapper
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers     return method(*args, **kwargs)
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers   File /opt/stack/networking-odl/networking_odl/ml2/mech_driver_v2.py, line 139, in update_port_precommit
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers     context, odl_const.ODL_PORT, odl_const.ODL_UPDATE)
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers   File /opt/stack/networking-odl/networking_odl/ml2/mech_driver_v2.py, line 109, in _record_in_journal
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers     ml2_context=context)
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers   File /opt/stack/networking-odl/networking_odl/journal/journal.py, line 121, in record
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers     raise exception.RetryRequest(e)
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers RetryRequest
2017-11-20 10:14:20.192 16601 ERROR neutron.plugins.ml2.managers

I can also take the mac address of a port I think has leaked and grep the
karaf.log and see that it did get an "add event" but never a "remove event".
Whereas you can see the add and remove in the passing job's karaf.log

[NETVIRT-1019] CSIT Sporadic failures - port leak in tempest suite Created: 20/Nov/17 Updated: 23/Jul/18 Resolved: 23/Jul/18
Status:	Verified
Project:	netvirt
Component/s:	General
Affects Version/s:	None
Fix Version/s:	None

[NETVIRT-1019] CSIT Sporadic failures - port leak in tempest suite Created: 20/Nov/17 Updated: 23/Jul/18 Resolved: 23/Jul/18