Add wait for etcd for flannel network plugin

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

roles/network_plugin/flannel/tasks/main.yml

@@ -11,6 +11,14 @@
     dest: /etc/kubernetes/manifests/flannel-pod.manifest
   notify: delete default docker bridge
 
+- name: Flannel | wait for etcd
+  uri: url=http://localhost:2379/health
+  register: result
+  until: result.status == 200
+  retries: 10
+  delay: 5
+  when: inventory_hostname in groups['kube-master']
+
 - name: Flannel | Wait for flannel subnet.env file presence
   wait_for:
     path: /run/flannel/subnet.env