Simplify docker role, cbr0 for calico isn't required anymore

roles/docker/tasks/configure.yml

 ---
-- name: Write script for calico/docker bridge configuration
-  template: src=create_cbr.j2 dest=/etc/network/if-up.d/create_cbr mode=u+x backup=yes
-  when: kube_network_plugin is defined and kube_network_plugin == "calico"
-
-- name: Configure calico/docker bridge
-  command: /etc/network/if-up.d/create_cbr
-  when: kube_network_plugin is defined and kube_network_plugin == "calico"
-
 - name: enable docker
   service:
     name: docker

roles/docker/templates/create_cbr.j2

-#!/bin/bash
-
-# Create calico bridge cbr0 if it doesn't exist
-ifaces=$(ifconfig -a | sed 's/[ \t].*//;/^\(lo\|\)$/d' |tr '\n' ' ')
-if ! [[ "${ifaces}" =~ "cbr0" ]];then
-   brctl addbr cbr0
-   ip link set cbr0 up
-fi
-
-# Configure calico bridge ip
-br_ips=$(ip addr list cbr0 |grep "inet " |cut -d' ' -f6)
-if ! [[ "${br_ips}" =~ "{{ br_addr }}/{{ kube_network_node_prefix }}" ]];then
-       ip a add {{ br_addr }}/{{ kube_network_node_prefix }} dev cbr0
-fi

roles/docker/templates/default-docker.j2

@@ -4,9 +4,7 @@
 #DOCKER="/usr/local/bin/docker"
 
 # Use DOCKER_OPTS to modify the daemon startup options.
-{% if kube_network_plugin is defined and kube_network_plugin == "calico" %}
-DOCKER_OPTS="--bridge=cbr0 --iptables=false --ip-masq=false"
-{% endif %}
+#DOCKER_OPTS=""
 
 # If you need Docker to use an HTTP proxy, it can also be specified here.
 #export http_proxy="http://127.0.0.1:3128/"