Add hamysql to ha controller

I tested it.  The caveat is that the puppet agent must be run
twice with include_mysql set to true.  After that, the other include_
booleans may be set to true and the puppet agent re-run (although it
may be possible to do two total runs rather than three, have not
tested that yet).  Note that while service db_password's are
configurable, db_usernames are not (e.g., the cinder db user is always
"cinder").  This is consistent with the existing standalone HA Mysql
host group.