Remove user_relns() SRF from regression tests.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: d1595525bdaffa1bc2812fcda8a151cfbdc81a47
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-10-08T22:43:01Z
Releases: 9.5.5
Remove user_relns() SRF from regression tests.

Back-patch commit 0dba54f1666ead71c54ce100b39efda67596d297 into the older
branches.  This test is almost as much of a patching hazard there as it is
in HEAD, and it has no more reason to be needed than it does in HEAD.

I went back as far as 9.2; I judged 9.1 not worth the trouble since
it's on the verge of being EOL'd.

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