Adjustments to regression tests for security_barrier views.

Robert Haas <rhaas@postgresql.org>

Commit: 49562f5eb66f31940dd7b64555bbd81bae952387
Author: Robert Haas <rhaas@postgresql.org>
Date: 2012-01-24T13:46:32Z
Releases: 9.2.0
Adjustments to regression tests for security_barrier views.

Drop the role we create, so regression tests pass even when run more
than once against the same cluster, a problem noted by Tom Lane and
Jeff Janes.  Also, rename the temporary role so that it starts with
"regress_", to make it unlikely that we'll collide with an existing
role name while running "make installcheck", per further gripe from
Tom Lane.

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