Revert MAINTAIN privilege and pg_maintain predefined role.
This reverts the following commits:
4dbdb82513,
c2122aae63,
5b1a879943,
9e1e9d6560,
ff9618e82a,
60684dd834,
4441fc704d,
and
b5d6382496. A role with the MAINTAIN privilege may be able to
use search_path tricks to escalate privileges to the table owner.
Unfortunately, it is too late in the v16 development cycle to apply
the proposed fix, i.e., restricting search_path when running
maintenance commands.
Bumps catversion.
Reviewed-by: Jeff Davis
Discussion: https://postgr.es/m/E1q7j7Y-000z1H-Hr%40gemulon.postgresql.org
Backpatch-through: 16