This command will display all ZooKeeper data for a given provider,
and provide and option to remove all of the data from ZooKeeper.
This can be useful when an operator must permanently remove a
pre-existing provider from nodepool and cannot cleanly shutdown
the services otherwise.
Example:
nodepool info rax
nodepool info --erase rax
Change-Id: I527aae5ff89aac864f984af050abb83e7bc3ac04