Move db syncs into mysql base role

Move db syncs into mysql base role

This patch moves the various DB syncs into the MySQL role.

Database creation needs to occur on the MySQL server to
avoid permission issues.

This patch also moves database creation to step 2 so we can
guarantee that all per-service databases exist at this time.
This avoids complex ordering needed during step 3 where
services, on different hosts, can run their own db sync's
in a distributed fashion.

Change-Id: I05cc0afa9373429a3197c194c3e8f784ae96de5f
Partial-bug: #1620595