Eschew "RESET statement_timeout" in tests.

Noah Misch <noah@leadboat.com>

Commit: 8e3b4d9d40244c037bbc6e182ea3fabb9347d482
Author: Noah Misch <noah@leadboat.com>
Date: 2015-10-20T04:37:22Z
Releases: 9.6.0
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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