Fix weave on RHEL deployment

Reduce retry delay checking weave
Always load br_netfilter module

roles/kubernetes-apps/network_plugin/weave/tasks/main.yml

@@ -28,7 +28,7 @@
     return_content: yes
   register: weave_status
   retries: 180
-  delay: 10
+  delay: 5
   until: "{{ weave_status.status == 200 and
     'Status: ready' in weave_status.content }}"
   when: inventory_hostname == groups['kube-master'][0]