Update abstime expected results to match post-30-June-2001 reality.

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

Commit: 755e367cb20091aa0ef5637c0e8882b8db6b39fe
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2001-07-02T19:31:52Z
Releases: 7.2.1
Update abstime expected results to match post-30-June-2001 reality.
Probably the right fix is to remove 'current' special value entirely,
but I don't want to see regression test failures until that happens.

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