weave: Upgrade to 2.5.1 (#4248)

Upstream Changes:

  - weave 2.5.1 (https://github.com/weaveworks/weave/releases/tag/v2.5.1)

Our Changes:

  - Sync templates with upstream changes

roles/network_plugin/weave/templates/weave-net.yml.j2

@@ -222,7 +222,8 @@ items:
             seLinuxOptions: {}
           serviceAccountName: weave-net
           tolerations:
-            - operator: Exists
+            - effect: NoSchedule
+              operator: Exists
             # Mark pod as critical for rescheduling (Will have no effect starting with kubernetes 1.12)
             - key: CriticalAddonsOnly
               operator: "Exists"