lib/, src/: update audit messages

lib/, src/: update audit messages

Auditing has been broken for a long time upstream and Fedora had some
downstream patches that fixed it, upstreaming that content to fix the
problem for everybody.

The audit of a user is performed through the AUDIT_USER_* macros.
Similarly, the audit of a group is performed through the AUDIT_GRP_*
macros. Part of the audit performed for groups was incorrectly labeled
as a user, and therefore some changes needed to be made to label them
correctly.

Signed-off-by: Iker Pedrosa <ipedrosa@redhat.com>
Reviewed-by: Alejandro Colomar <alx@kernel.org>