Move pgsqlms to a different namespace?

We are currently installing `pgsqlms` to the `heartbeat` namespace.

This choice is arguable for some reasons:
- it seems the `heartbeat` namespace is expected to host official RA from the resource-agents project
- `heartbeat` is a pretty misleading namespace as heartbeat is long deprecated in favor of Pacemaker
- there are on-going discussions about this `heartbeat` namespace (deprecating it? moving official RA to the `Pacemaker` namespace?). See: https://www.mail-archive.com/developers@clusterlabs.org/msg00241.html

We should probably create the `PAF` namespace and install `pgsqlms` in there by default.