rpm: fix "warning: File listed twice: .../glusterd.info"

Commit a482e422 added glusterd.info to the %files section of the
glusterfs-server package. However, this file was listed already. This
causes the following warning when building the RPMs:

    warning: File listed twice: /var/lib/glusterd/glusterd.info

Merging the attributes for /var/lib/glusterd/glusterd.info into one line
prevents this warning.

Change-Id: I0d518ec186a8725dc4c5cba00b60da83fdadf103
BUG: 1005161
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/5836
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Anand Avati <avati@redhat.com>