Make contrib regression tests safe for Danish locale.

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

Commit: ba64aed7004a88f66ef204cd8b18c2c5621b2f30
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-07-21T20:52:36Z
Releases: 9.1.23
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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