public class RestartPersistentServices
Task restarts persistent physical services that should be running on this
host but which are not discoverable using jini (not found when we query for
their ServiceID) and apparently disconnected from zookeeper (their
ephemeral znode is not found in the BigdataZooDefs.MASTER_ELECTION
container). Service restarts are logged. An error is logged if a service can
not be restarted. It is an error if the ZooKeeper client is not
connected. It is an error if no ServiceRegistrars are joined.