Network protocol extensions for the seek() FOP. The format is based on the SEEK procedure in NFSv4.2. Change-Id: I060768a8a4b9b1c80f4a24c0f17d630f7f028690 BUG: 1220173 Signed-off-by: Niels de Vos <ndevos@redhat.com> Reviewed-on: http://review.gluster.org/11482 Smoke: Gluster Build System <jenkins@build.gluster.com> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.com> Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com> Reviewed-by: Jeff Darcy <jdarcy@redhat.com>