make a copy of the node state file before renaming the nodes
make a copy of the node state file before renaming the nodes

Signed-off-by: Nadia Odunayo <770d4af3b77d1305f931707818c607911f43c4da@pivotal.io>

pivotal-cf/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,ryheena/rabbitmq,ryheena/rabbitmq,pivotal-cf/cf-rabbitmq-release,shinji62/cf-rabbitmq-release,pivotal-cf/cf-rabbitmq-release,shinji62/cf-rabbitmq-release