pgsql: Remove user_relns() SRF from regression tests.

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.

Branch
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REL9_6_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/b89f07b592210be3906d8201f03f0cf569f0dd83

Modified Files
--------------
src/test/regress/input/create_function_2.source  |   9 --
src/test/regress/input/misc.source               |   3 -
src/test/regress/output/create_function_2.source |   8 --
src/test/regress/output/misc.source              | 138 -----------------------
4 files changed, 158 deletions(-)