Remove new, intermittently failing regression test.

Robert Haas <rhaas@postgresql.org>

Commit: dc66f1c5f2a6e93d949252a0ad661388e1fe7856
Author: Robert Haas <rhaas@postgresql.org>
Date: 2012-02-14T04:43:24Z
Releases: 9.2.0
Remove new, intermittently failing regression test.

Per buildfarm.

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