Revert "QE writer should cancel QE readers before aborting"
This reverts commit 206ffa6c. The solution is not sufficient. The writer does not confirm that all readers have stopped executing the query plan before marking the transaction as aborted. Discussion: https://groups.google.com/a/greenplum.org/d/msg/gpdb-dev/S2WL1FtJEJ0/6ngoCuQNCwAJ See also: https://github.com/greenplum-db/gpdb/pull/6283#issuecomment-440839857
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