Clean up haproxy_service['mysqld']->Anchor['galera'] dep.

Found that it was possible to have puppet fail to parse and find the dep
 for haproxy_service['mysqld']. We now use a spaceship to search for and
 ensure the relationship.

During the adventure found that there was some related code that needed
 some light cleaning.

Change-Id: Id12fb3a52859d2ec3fe2b3982b956da7fba0ae44
closes-bug: #1336041
Merge "Clean up haproxy_service['mysqld']->Anchor['galera'] dep."