Add missing quota flags in the config file sample

l3 extensions don't set quota flags in the config sample file
etc/neutron.conf.
Quota is unlimited if its value is minus and not only if it's -1.

Closes-Bug: #1250574
Change-Id: I76c8d1e2676d4e9b0feeed6e504e759fe736a0db
Fix NoSuchOptError in lbaas agent test

Option 'periodic_interval' doesn't exist when using testtools
to test lbaas agent, fix this by adding a mock object.

Change-Id: I5ef02d6fa154ea7a18ca77d02a2704b7e3990c3b
Closes-Bug: #1264260
Remove unused imports

Remove unused imports in tools/install_venv.py

Change-Id: Ia2fbb4ece5c8bcdee96503f0f853f826ae4f3dfa
Closes-Bug: #1265267
Fix empty network deletion in db_base_plugin for postgresql

Need to disable joined loads for port query in delete_network
as in other methods.

No unit test is being added, because the problem is not reproducible with
sqlite.

Closes-Bug: #1261652

Change-Id: I7a015be6f2f9b8ae43bc29a767d16af30120f13f
Merge "Fix NoSuchOptError in lbaas agent test"
Merge "Add missing quota flags in the config file sample"
Merge "Remove unused imports"
Imported Translations from Transifex

Change-Id: Ie39eae9336254407ac8688135f932763d860cf7b
Merge "Fix empty network deletion in db_base_plugin for postgresql"
Merge "Imported Translations from Transifex"