ML2 plugin involves in agent_scheduler migration

In agent_scheduler migration script which creates
network-dhcp-binding table and router-l3-binding table,
ML2 plugin should be included in the plugin list.

Change-Id: If39ef2a488513a58d608c70e26a2b9f960dbe904
Closes-Bug: #1293089
Imported Translations from Transifex

Change-Id: I78925e933b51f5cc7a5b3d71e35eb4819af869ba
Merge "ML2 plugin involves in agent_scheduler migration"
Merge "Imported Translations from Transifex"