RUBY-793 Lock rest-client at 1.6.8
Support 2.7 in db#add_user and additional UNAUTHORIZED error code
Testing rake task and test unit helper updates for ensuring admin user
Functional test suite updates for narrow localhost exception
Authentication test fixes to work with narrowed localhost exception
Temporarily disable replica set and sharded cluster tests
Logic mistake
Try 10 times to connect to mongod to set up admin user