glusterd: Bump GD_MAX_OP_VERSION

Change-Id: I7a212435ce7e98fe01aad2c0d1f698de8ea84235
BUG: 981278
Signed-off-by: Kaushal M <kaushal@redhat.com>
Reviewed-on: http://review.gluster.org/5287
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>