Sync service and systemd modules from oslo-incubator

This patch make systemd know when neutron-service was started. This is
needed in HA environment, previously systemd returned success even
before neutron-server was able to handle requests.

Current oslo-incubator commit on HEAD:
b7ad6ddab8b1d61bf4f52ccaa461a9d68809747b

Implements: blueprint service-readiness
Change-Id: Ic9e4abd11b614a896fbd7454b9a604a69a248d0f
BigSwitch: Improves server manager UT coverage

Improves the unit test coverage for the Big Switch
server manager module (100%). Also reorganizes the
capabilities test to avoid duplicating a lot of
router tests that are already covered.

Closes-Bug: #1289027
Change-Id: Ib51e8160f8d95686e86430b0a9c9f54deeda0e84
Add missing comma in nsx router mappings migration

Change-Id: I85bcc9b7fe636f34dbdf6f8c3172352c8e586e2a
Closes-bug: #1303179
Related-bug: #1207402
Imported Translations from Transifex

Change-Id: If8a4e8411119e156943771962b6d959c6936f6af
Merge "BigSwitch: Improves server manager UT coverage"
Merge "Add missing comma in nsx router mappings migration"
Merge "Imported Translations from Transifex"
Merge "Sync service and systemd modules from oslo-incubator"