Fix typ-o for default network chunk size

Change-Id: I1d9ac223f3aede531fba86e213e9dd4f48739f0a
Signed-off-by: Peter Portante <peter.portante@redhat.com>
Reviewed-on: http://review.gluster.org/5766
Reviewed-by: Luis Pabon <lpabon@redhat.com>
Tested-by: Luis Pabon <lpabon@redhat.com>