Add explicit regression tests for ALTER TABLE lock levels.

Simon Riggs <simon@2ndQuadrant.com>

Commit: 04e17bae50a73af524731fa11210d5c3f7d8e1f9
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2010-07-29T11:06:34Z
Releases: 9.1.0
Add explicit regression tests for ALTER TABLE lock levels.
Use this to catch a couple of lock level assignments that slipped
through manual testing, per Peter Eisentraut.

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