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

(this is the master branch)

sync with Fedora glusterfs.spec 3.4.1-2+

Change-Id: I8a303efb0ac8cd3e04531e2f02427e3590387493
BUG: 950083
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/6059
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>