Test Results:
[root@ask-02 ~]# rpm -q pcs
pcs-0.9.90-2.el6_5.2.noarch
[root@ask-02 ~]# grep uidgid /etc/cluster/cluster.conf
[root@ask-02 ~]# pcs cluster uidgid add uid=feist gid=feistgid
[root@ask-02 ~]# grep uidgid /etc/cluster/cluster.conf
  <uidgid gid="feistgid" uid="feist"/>
[root@ask-02 ~]# pcs cluster uidgid rm uid=feist gid=feistgid
[root@ask-02 ~]# grep uidgid /etc/cluster/cluster.conf
[root@ask-02 ~]#

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-1848.html