build: sync glusterfs.spec.in with Fedora glusterfs.spec

(this is the release-3.4 branch)

sync with Fedora glusterfs.spec 3.4.1-2+

Change-Id: I13e7161dca969804415045a47e37705819fe173d
BUG: 819130
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/6058
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>