HBASE-15295 MutateTableAccess.multiMutate() does not get high priority causing a deadlock - ADDENDUM for failing test

Author: enis

hbase-server/src/test/java/org/apache/hadoop/hbase/client/HConnectionTestingUtility.java

@@ -160,6 +160,7 @@ public static ClusterConnection getMockedConnectionAndDecorate(final Configurati
     Mockito.when(c.getNewRpcRetryingCallerFactory(conf)).thenReturn(
         RpcRetryingCallerFactory.instantiate(conf,
             RetryingCallerInterceptorFactory.NO_OP_INTERCEPTOR, null));
+    Mockito.when(c.getRpcControllerFactory()).thenReturn(Mockito.mock(RpcControllerFactory.class));
     HTableInterface t = Mockito.mock(HTableInterface.class);
     Mockito.when(c.getTable((TableName)Mockito.any())).thenReturn(t);
     ResultScanner rs = Mockito.mock(ResultScanner.class);