Un-break horology regression test.

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

Commit: 362f731dde94b10f8a01e80fddd2bf99c4f66587
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2011-11-06T23:20:26Z
Releases: 9.2.0
Un-break horology regression test.

Adjust ill-considered timezone-dependent tests added in commit
8a3d33c8e6c681d512f79af4a521ee0c02befcef so that they won't fail on DST
transition days.  Per all-pink buildfarm.

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