build: glusterfs.spec.in, adding nfs-utils package dependency for server package

nfs-utils provides rpc.statd and it is a requirement for gluster-nfs

Master review:    http://review.gluster.org/7966
Master commit-Id: c34850ec71c9d6a4f30ad2e5e96aa15bc8a87064

Change-Id: I054b7d6d8fb1efe0fed9c90077a93c4f559c1ef4
BUG: 1113007
Reported-by: Satheesaran Sundaramoorthi <sasundar@redhat.com>
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Signed-off-by: Vikhyat Umrao <vumrao@redhat.com>
Reviewed-on: http://review.gluster.org/8172
Tested-by: Gluster Build System <jenkins@build.gluster.com>