enable more HA services, and enable HA neutron layout.

This enables swift, mysql, horizon, and neutron services for HA.

Note that:
1) you probably need to drop your db before re-running puppetclass import
and rake db:seed, since I changed the name of the HA controller, and
seeds.rb isn't quite smart enough to catch that it's a rename rather than an addition
Alternatively, go into rails console and delete all Staypuft::Role objects and
Staypuft::Layout objects prior to re-running db:seed
2) after this change, we probably need to remove the separate db node. To test this
you can probably just not add any hosts to the database role, but we should probably
remove that role entirely once this change is merged.