Clean up roles from roleattributes test

Stephen Frost <sfrost@snowman.net>

Commit: 072710dff3eef4540f1c64d07890eb128535e212
Author: Stephen Frost <sfrost@snowman.net>
Date: 2015-08-21T19:51:24Z
Releases: 9.6.0
Clean up roles from roleattributes test

Having the roles remain after the test ends up causing repeated 'make
installcheck' runs to fail and may be risky from a security perspective
also, so remove them at the end of the test.

Files