Apply VPN migration to correct plugin

This patch ensures the migration is executed when
VPNDriverPlugin is loaded among service plugins.

Bug 1229394

Change-Id: Ibf50d23aebc60b2ba22ef5a51c268b93761c2171
Neutron network delete fails with brocade plugin

Fixes bug: 1223747

Change-Id: I4a8235d4dcb0c14477835afafd0b5459ce6b01f6
Imported Translations from Transifex

Change-Id: I3752ae949a430854eceea2cc10f08024e9a566d7
Properly synchronize status for ports deleted from backend

Ensure that the status for a port is properly synchronized even
when the port itself does not exist anymore in the backend, avoiding
raising exceptions due to missing results in the NVP query.

This patch also adjusts a comment and improves exception handling
in _nvp_get_port_id

Bug 1229331

Change-Id: Ibaa581006c994a543c1795dd3f1d50086583b953
Merge "Apply VPN migration to correct plugin"
Merge "Neutron network delete fails with brocade plugin"
Merge "Imported Translations from Transifex"
Merge "Properly synchronize status for ports deleted from backend"