change pg_hba.conf to be owned by postgres user account

At present, the ownership of pg_hba.conf is hardwired to be uid 0.  It should have the same ownership as all of the other postgressql configuration files in the same cluster so that they can be managed/edited by the postgres role user (system) account.
Merge pull request #372 from jhoblitt/feature/pg_hba.conf-ownership

change pg_hba.conf to be owned by postgres user account