Added task to check that an entry for an instance's username exists in pg_hba.conf
Added task to check that an entry for an instance's username exists in pg_hba.conf

The instance creation was failing on syncdb because the user hadn't yet been granted permissions.

denverfoundation/storybase,denverfoundation/storybase,denverfoundation/storybase,denverfoundation/storybase