added logging for activation of colocated backups
HORNETQ-1422 - use default cluster connection for auth

https://issues.jboss.org/browse/HORNETQ-1422

If the acceptor used to connect to by the cluster controller is not associated witha cluster connection we use the default and its security for authentication.
fixing examples

fixes configuration for new ha-policy configuration and slight tweak to the Shared Nothing Activation.
Merge pull request #1877 from andytaylor/master

example fix and other tweaks