Fix this annoying test

Man. We really aren't testing replication, or how fast these chunks get
replicated to the server we hit. We cannot use tagged WriteConcern and
ReadPreferenceTags as this test is meant to test slaveOkay()
exclusively, which tags would mess up. Rather then verifying the output
of the queries/commands, we just need to know that we hit the
secondaries
These are failing randomly as we are hitting the arbiter.. because its missing the replicaSet param :)
Not all servers are this fast
Merged Pull Request #405

* pull-request/405:
  Not all servers are this fast
  These are failing randomly as we are hitting the arbiter.. because its missing the replicaSet param :)
  Fix this annoying test