adding STOP command support
adding STOP command support

virtdb/virtdb-fdw,dbeck/virtdb-fdw,starschema/virtdb-fdw,virtdb/virtdb-fdw,starschema/virtdb-fdw,starschema/virtdb-fdw,dbeck/virtdb-fdw,dbeck/virtdb-fdw,starschema/virtdb-fdw,virtdb/virtdb-fdw,dbeck/virtdb-fdw,virtdb/virtdb-fdw