Revert "SERVER-16002 SERVER-16369 Cluster / standalone auth tests."

This reverts commit 11b2d7b6051766674c2d66c86d9f23d0befdee09.
Revert "SERVER-16196 Enable execution of workloads against standalone mongod."

This reverts commit 113fb30b65cded6ece1160c962d64fa232440b7d.

Will re-enable the tests once memory overhead issues with the
mongo shell are resolved.