Make contrib regression tests safe for Danish locale.

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

Commit: d365dc3d1bdb5b54c61a8dfaf2d2fd948419c752
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-07-21T20:52:36Z
Releases: 9.5.4
Make contrib regression tests safe for Danish locale.

In btree_gin and citext, avoid some not-particularly-interesting
dependencies on the sorting of 'aa'.  In tsearch2, use COLLATE "C" to
remove an uninteresting dependency on locale sort order (and thereby
allow removal of a variant expected-file).

Also, in citext, avoid assuming that lower('I') = 'i'.  This isn't relevant
to Danish but it does fail in Turkish.

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