Disable fsync throughout TAP test suites.

Noah Misch <noah@leadboat.com>

Commit: 8d60549d6d39fbc1501f11a31f007c36975891e8
Author: Noah Misch <noah@leadboat.com>
Date: 2015-09-03T04:29:43Z
Releases: 9.5.0
Disable fsync throughout TAP test suites.

Most suites already did so via start_test_server(), but the pg_rewind,
pg_ctl and pg_controldata suites ran a postmaster or initdb with fsync
enabled.  This halves the pg_rewind suite's runtime on buildfarm member
tern.  It makes tern and that machine's other buildfarm members less
vulnerable to noise failures from postmaster startup overrunning the 60s
pg_ctl timeout.  Back-patch to 9.5, where pg_rewind was introduced.

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