Change calicoctl deployment to use container

Improves upgradability of calicoctl by leveraging docker tags.

roles/network_plugin/calico/templates/calicoctl-container.j2

@@ -0,0 +1,8 @@
+#!/bin/bash
+/usr/bin/docker run --privileged --rm \
+--net=host -e ETCD_AUTHORITY=127.0.0.1:2379 \
+-v /usr/bin/docker:/usr/bin/docker \
+-v /var/run/docker.sock:/var/run/docker.sock \
+-v /var/run/calico:/var/run/calico \
+{{ calicoctl_image_repo }}:{{ calicoctl_image_tag}} \
+$@