Suppress DROP CASCADE notices in regression tests

Stephen Frost <sfrost@snowman.net>

Commit: 81d815dc3ed74a7d20f7b4c7d87c42816c7ee7af
Author: Stephen Frost <sfrost@snowman.net>
Date: 2014-11-25T15:04:49Z
Releases: 9.5.0
Suppress DROP CASCADE notices in regression tests

In the regression tests, when doing cascaded drops, we need to suppress
the notices from DROP CASCADE or there can be transient regression
failures as the order of drops can depend on the physical row order in
pg_depend.

Report and fix suggestion from Tom.

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