Make src/test/recovery/t/017_shm.pl safe for concurrent execution.

Noah Misch <noah@leadboat.com>

Commit: 0e0d449fb02ae42b97f9a3b4ccf956fbb1e64565
Author: Noah Misch <noah@leadboat.com>
Date: 2019-04-04T06:16:57Z
Releases: 9.6.13
Make src/test/recovery/t/017_shm.pl safe for concurrent execution.

Buildfarm members idiacanthus and komodoensis, which share a host, both
executed this test in the same second.  That failed.  Back-patch to 9.6,
where the test first appeared.

Discussion: https://postgr.es/m/20190404020543.GA1319573@rfd.leadboat.com

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src/test/recovery/t/017_shm.pl modified +28 −5

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