Major - P3 Running a test using "buildscripts/smoke.py --auth --authMechanism=CRAM-MD5 <testfile>" still does all authentication using MONGO-CR. See this log excerpt from the special RHEL special builder:
Authenticating to admin database as admin with mechanism MONGO-CR on connection: connection to bs-e-rhel57:31000
m31000| Mon Feb 11 02:27:25.724 [conn1] authenticate db: admin { authenticate: 1, nonce: "fce6c88b44354537", user: "admin", key: "78c2c33b1af4bc1eebb84bdfee1a5ce4" }