Eschew "RESET statement_timeout" in tests.

Noah Misch <noah@leadboat.com>

Commit: 0c7390d6240693eae1e357dc119b3a26c2836bb0
Author: Noah Misch <noah@leadboat.com>
Date: 2015-10-20T04:37:45Z
Releases: 9.3.11
Eschew "RESET statement_timeout" in tests.

Instead, use transaction abort.  Given an unlucky bout of latency, the
timeout would cancel the RESET itself.  Buildfarm members gharial,
lapwing, mereswine, shearwater, and sungazer witness that.  Back-patch
to 9.1 (all supported versions).  The query_canceled test still could
timeout before entering its subtransaction; for whatever reason, that
has yet to happen on the buildfarm.

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