Replace references to COLLATE "en_CA" with COLLATE "POSIX".

Robert Haas <rhaas@postgresql.org>

Commit: cd5d3af44e2a4f73c692d4653941c0516f967cb7
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-12-07T18:47:34Z
Releases: 10.0
Replace references to COLLATE "en_CA" with COLLATE "POSIX".

Another attmempt to fix the tests which were added by commit
f0e44751d7175fa3394da2c8f85e3ceb3cdbfe63.

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