test lb with max nodes
Merge branch 'master' into tests-for-lbaas
AUTO-816: Disconnecting from cass on shutdown

LoggingCQLClient.disconnect is implemented in silverberg 0.1.6. Hence
the version upgrage
kazoo client is stopped on shutdown
lint fix
RetryingAuthenticator implemented

It retries authenticate_tenant until it succeeds or times out
AUTO-808: Retrying auth

Using RetryingAuthenticator before actual authenticator and caching its
result
remove prints
Merge branch 'master' into tests-for-lbaas
added test for invlaid lb among multiple lb group
Getting oldest event from a bucket
A mixin for functions returning deferreds
Scheduler health check implemented

It is unhealthy if it is not allocted and when an event in any of the
buckets is too old
changed limit for repose tests and unskipped over limit tests
changing limits.
Change create group consistency level to quorum
Allow the cass view_state to take an optional consistency level
In cass, call view state from modify state with the modify state's consistency level
Modify state should also be quorum
Change verify delete to just delete over and over again