Enable replicasets unconditionally

Once #82 lands, we can enable replsets
unconditionally. This makes it possible
to do limited testing of HA on the local
provider currently, and gets rid of a
code burden that we don't need.
Merge pull request #83 from axw/replset-always

Enable replicasets unconditionally

Once #82 lands, we can enable replsets
unconditionally. This makes it possible
to do limited testing of HA on the local
provider currently, and gets rid of a
code burden that we don't need.