Make neutron server/ml2 profiles match t-h-t

Make neutron server/ml2 profiles match t-h-t

This patch brings the neutron profiles and the
associated steps in line with what already happens in
t-h-t. Specifically:

 -we want to create the db $step >= 2 and $sync_db
 -we want to make sure plugin.ini exists before the neutron dbsync
 -we want to make sure the db sync runs before neutron::server starts
  when using pacemaker
 -split the neutron server profiles. They are quite different across
  pacemaker and base.

Change-Id: I52815f45a04bf3e39940b9cb116261730580a3e2