Remove newly-added regression test cases that referenced pg_stats.

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

Commit: 7cec608b7a480c3aea8657bbb17d4a45a282d143
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2008-12-15T16:52:16Z
Releases: 8.3.6
Remove newly-added regression test cases that referenced pg_stats.
The proposed fix for this is a behavioral change that probably shouldn't
get back-patched, and it doesn't seem worth putting a workaround into
a back branch.

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