@Override
  protected void completionCleanup(final MasterProcedureEnv env) {
    releaseSyncLatch();
  }
Comparing the value associated with a given key across two TableDescriptor instances'
properties.
@return True if the table property <code>key</code> is the same in both.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/ModifyTableProcedure.java