xsync for latest tar and few modification on usage.
      * Usage: ./xsync.sh <master-vol> -i <id_rsa path> ssh://IP::<slave-vol>
        eg..  ./xsync.sh master_vol -i ~/.ssh/id_rsa ssh://zii.in::slave_vol

      * Turn ON marker using "gluster volume set <vol> geo-replication.indexing on"

Signed-off-by: Ajeet <ajha@redhat.com>