Add test for cluster init with failing contact points (JAVA-522).
Don't run updateCreatedPools during session initialization (JAVA-522).
Mark failing contact points down in control connection init (JAVA-522).
Don't trigger onAdd in Cluster.Manager.init (JAVA-522).
Parallelize pool creations when creating the first session (JAVA-522).
Rename method.
Clean up unsubmitted futures at shutdown.

This can cause thread starvation in some cases.