Clean up roles from roleattributes test

Stephen Frost <sfrost@snowman.net>

Commit: 93fcb4ae3e4b20e8562f0a8cab3a3a486ad84e76
Author: Stephen Frost <sfrost@snowman.net>
Date: 2015-08-21T19:51:29Z
Releases: 9.5.0
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