Abandon cdbdisp_dispatchUtilityStatement
cdbdisp_dispatchUtilityStatement is designed to dispatch a utility statement synchronously used by DefineIndex(), DefineExternalRelation(), DefineRelation() and createdb(). The formor three function actually use it in asynchronous way, so replace it with CdbDispatchUtilityStatement. createdb() use it synchronously, but the performance improvement is little. To make code clean, abandon this function and replace it with asynchronous version.
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