Avoid and detect SIGPIPE race in TAP tests.

Noah Misch <noah@leadboat.com>

Commit: ac93acbc05be2ef995208c1ca17f8083f60ccc53
Author: Noah Misch <noah@leadboat.com>
Date: 2017-12-16T18:03:38Z
Releases: 10.2
Avoid and detect SIGPIPE race in TAP tests.

Don't write to stdin of a psql process that could have already exited
with an authentication failure.  Buildfarm members crake and mandrill
have failed once by doing so.  Ignore SIGPIPE in all TAP tests.
Back-patch to v10, where these tests were introduced.

Reviewed by Michael Paquier.

Discussion: https://postgr.es/m/20171209210203.GC3362632@rfd.leadboat.com

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