geo-rep: create hardlink as hardlinks in xsync crawl

BUG: 847839
Change-Id: Ieaa754f15611392c09afcc7190b9ff9da39d7fce
Signed-off-by: Amar Tumballi <amarts@redhat.com>
Reviewed-on: http://review.gluster.org/5934
Reviewed-by: Venky Shankar <vshankar@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>