weave: Upgrade to 2.4.0

Upstream Changes:

-   weave 2.4.0 (https://github.com/weaveworks/weave/releases/tag/v2.4.0)
-   Support `externalTrafficPolicy: Local` (https://github.com/weaveworks/weave/issues/2924)
-   Make the ipset list size bigger (https://github.com/weaveworks/weave/pull/3305)
-   Break out of kube rm-peers loop if nothing changes (https://github.com/weaveworks/weave/pull/3317)

Our Changes:

-   Revamp weave-net.yml.j2 with upstream changes
-   Add more variables for customization
-   Replace WEAVE_PASSWORD with k8s secret
-   Remove hard-corded seed mode support, in favor of variables customization

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

@@ -1,4 +1,5 @@
 ---
+
 - name: Weave | Start Resources
   kube:
     name: "weave-net"
@@ -9,13 +10,12 @@
     state: "latest"
   when: inventory_hostname == groups['kube-master'][0]
 
-- name: "Weave | wait for weave to become available"
+- name: Weave | Wait for Weave to become available
   uri:
     url: http://127.0.0.1:6784/status
     return_content: yes
   register: weave_status
   retries: 180
   delay: 5
-  until: "{{ weave_status.status == 200 and
-    'Status: ready' in weave_status.content }}"
+  until: "{{ weave_status.status == 200 and 'Status: ready' in weave_status.content }}"
   when: inventory_hostname == groups['kube-master'][0]