HDDS-431. LeaseManager of CommandWatcher is not started.

Contributed by Elek, Marton.

(cherry picked from commit 8ffbbf51c9a0f9bbcd9ee7452d95e588a2cb87ac)

hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/server/StorageContainerManager.java

@@ -613,6 +613,8 @@ public final class StorageContainerManager extends ServiceRuntimeInfoImpl
             "StorageContainerLocationProtocol RPC server",
             getClientRpcAddress()));
     DefaultMetricsSystem.initialize("StorageContainerManager");
+
+    commandWatcherLeaseManager.start();
     getClientProtocolServer().start();
 
     LOG.info(buildRpcServerStartMessage("ScmBlockLocationProtocol RPC " +