Add test for REVOKE ADMIN OPTION
The REVOKE ADMIN OPTION FOR <role_name> syntax didn't have ample
test coverage. Fix by adding coverage in the privileges test suite.
Author: Mark Dilger <mark.dilger@enterprisedb.com>
Discussion: https://postgr.es/m/
333B0203-D19B-4335-AE64-
90EB0FAF46F0@enterprisedb.com