mgmt/glusterd: Fix a minor typo.

Thanks to Patrick Matthäi <pmatthaei@debian.org> for the patch.
Signed-off-by: Vijay Bellur <vbellur@redhat.com>

Change-Id: I59da74298894ccc2ab30967ffe44cc844aa73f82
BUG: 814534
Reviewed-on: http://review.gluster.org/5436
Reviewed-by: Amar Tumballi <amarts@redhat.com>
Tested-by: Anand Avati <avati@redhat.com>