Run DB sync in nova-api element post configure.

We want to DB sync on each deploy.

Change-Id: I02b062499d7230aea3bdd3e97c979b03c160125d
Use os-apply-config everywhere

os-config-applier is being deprecated.

Change-Id: Iaaa5e77dcb16f1019e7bace0d6743d51bb61fd1a
Fix neutron credentials in nova config file

Currently, neutron_admin_username option is not set, so it
defaults to 'null'. This breaks nova-api and nova-compute
when they are talking to neutron-server.

Closes-Bug: #1253043

Change-Id: Iec07a6e6e99f65fdb759c6820f66342f10080ac2
Merge "Use os-apply-config everywhere"
Merge "Run DB sync in nova-api element post configure."
Merge "Fix neutron credentials in nova config file"