Add flannel version for v2.6.8
Add flannel version for v2.6.8

bcreane/calico,tomdee/calico,bcreane/calico,tomdee/calico,tomdee/calico,tomdee/calico,bcreane/calico,bcreane/calico,tomdee/calico,bcreane/calico,bcreane/calico