Allow to configure flanneld options.

Change-Id: I603ddebc5e5c42efa27d76e19f023cc2c224a367
diff --git a/kubernetes/files/kube-addons/flannel/flannel.yml b/kubernetes/files/kube-addons/flannel/flannel.yml
index 58d0217..f06618b 100644
--- a/kubernetes/files/kube-addons/flannel/flannel.yml
+++ b/kubernetes/files/kube-addons/flannel/flannel.yml
@@ -101,6 +101,9 @@
         args:
         - --ip-masq
         - --kube-subnet-mgr
+        {%- for option, value in master.network.flannel.flanneld_options.items() %}
+        - --{{ option }}={{ value }}
+        {%- endfor %}
         resources:
           requests:
             cpu: "100m"