This patch modifies mistral::db::sync so that it
runs 'update head' in addition to 'populate'.
This brings the mistral "db_sync" class more inline
with other Puppet Openstack modules that run DB sync
and fixes issues in bootstrapping mistral in that
running populate without first having an 'upgrade head'
would always fail. Both actions appear to be idempotent
so re-running them should be fine.
Change-Id: I13f037c3eea944d5f41ced904623e38ce3fcae44