GridFS auth failure on Jenkins

gistfile1.txt

File "/home/jenkins/workspace/edx-all-tests-auto-pr/SHARD/1/TEST_SUITE/bok-choy/common/lib/xmodule/xmodule/contentstore/mongo.py", line 40, in __init__
    _db.authenticate(user, password)
  File "/home/jenkins/edx-venv/local/lib/python2.7/site-packages/pymongo/database.py", line 902, in authenticate
    self.connection._cache_credentials(self.name, credentials)
  File "/home/jenkins/edx-venv/local/lib/python2.7/site-packages/pymongo/mongo_client.py", line 459, in _cache_credentials
    auth.authenticate(credentials, sock_info, self.__simple_command)
  File "/home/jenkins/edx-venv/local/lib/python2.7/site-packages/pymongo/auth.py", line 243, in authenticate
    auth_func(credentials[1:], sock_info, cmd_func)
  File "/home/jenkins/edx-venv/local/lib/python2.7/site-packages/pymongo/auth.py", line 222, in _authenticate_mongo_cr
    cmd_func(sock_info, source, query)
  File "/home/jenkins/edx-venv/local/lib/python2.7/site-packages/pymongo/mongo_client.py", line 693, in __simple_command
    helpers._check_command_response(response, None, msg)
  File "/home/jenkins/edx-venv/local/lib/python2.7/site-packages/pymongo/helpers.py", line 178, in _check_command_response
    raise OperationFailure(msg % errmsg, code, response)
OperationFailure: command SON([('authenticate', 1), ('user', u'redacted'), ('nonce', u'redacted'), ('key', u'redacted')]) failed: auth fails

MECHANISMS = frozenset(['GSSAPI', 'MONGODB-CR', 'MONGODB-X509', 'PLAIN'])
"""The authentication mechanisms supported by PyMongo."""