Fix InvalidInstanceID.NotFound handling

The matcher used with boto tests is returing with None,
 when it matches. The incorrect condition handling may lead to
longer deletion time or failure.

Change-Id: I7d03528ab6183dd9a49169c0a6ec2a4a95fb7d52
Extend network debug infos on network failures

After the https://review.openstack.org/#/c/76640/ is merge tempest will
be allowed to dump the ovs db.

The ovs db dump can help in identifying trunk/access port miss configuration
issues.

Change-Id: Ia751dc5046ce07369b9044eda3b20c63d38bac99
Merge "Extend network debug infos on network failures"
Merge "Fix InvalidInstanceID.NotFound handling"
Do not assert router l3 agent association

Just be removing the router from an agent, we does not prevent
neutron to reschedule the router to the same agent.

Since on dvsm gate we has only one l3 agent, it is the only scheduling
choose.

Closes-Bug: #1291694
Change-Id: Idf7d184d2493fef7f6faa17f0d95c1c9f853dfb1
Merge "Do not assert router l3 agent association"
Merge branch 'master' of https://github.com/openstack/tempest