public long submitProcedure(Procedure<TEnvironment> proc) {
    return submitProcedure(proc, null);
  }
Add a new root-procedure to the executor.
@param proc the new procedure to execute.
@return the procedure id, that can be used to monitor the operation
hbase-procedure/src/main/java/org/apache/hadoop/hbase/procedure2/ProcedureExecutor.java