Don't bail out if there are no existing members for a replica set in
chef-server mode - just configure as a single-member set.
Force sharding configuration for 'mongos' - the same way replicaset
reconfiguration is forced for 'replicaset'
allows one to add shards to a cluster and then re-ru
Merge 94835411f4a47ff4844f28476c0d3a9eb019c121 into 8c593917a228752d877b76b3c2995b6d6b1ffbdb