gsyncd / geo-rep: remove deprecated code!

This includes "xtime" base crawling and syncing,
"Blind" and "Wrapup" mixins for failover/failback.

Change-Id: I9bc8695dc1c19b1261332f64621305dff2929b32
BUG: 994461
Original Author: Venky Shankar <vshankar@redhat.com>
Signed-off-by: Venky Shankar <vshankar@redhat.com>
Reviewed-on: http://review.gluster.org/5514
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Avra Sengupta <asengupt@redhat.com>
Tested-by: Avra Sengupta <asengupt@redhat.com>
Reviewed-by: Anand Avati <avati@redhat.com>