nfs: change default nfs port to 2049

This change makes it possible to mount glusterfs volumes
without specifying vers=3 option.

Change-Id: If5a974e2bdfd2adbeac3d82af774310cdf30f988
BUG: 832939
Signed-off-by: Rajesh Amaravathi <rajesh@redhat.com>
Reviewed-on: http://review.gluster.org/4840
Reviewed-by: Niels de Vos <ndevos@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Reviewed-on: http://review.gluster.org/5078
Reviewed-by: Anand Avati <avati@redhat.com>