The hadoop library we use to connect with hdfs expects is is running in
a jvm dedicated to hadoop, as if it was an hdfs node. This means the
shutdown hooks hadoop tries to register expect to work; there is no
handling of a lack of permissions to add shutdown hooks. This commit
removes the shutdown hook permission currently granted to
repository-hdfs by replacing the ShutdownHookManager class with one of
the same api, but having no-ops for the public methods.
Mark Vieira
Ryan Ernst