Similar to calico, deploy flannel as a DS.
Flannel can use the kubernetes API to store
data, so it doesn't need to contact the etcd
server directly anymore.
This patch drops to relatively large files for
flannel's config, flannel-config-service.sh and
write-flannel-config.sh. All required config is
in the manifests.
Additional options to the controller manager:
--allocate-node-cidrs=true and --cluster-cidr.
Change-Id: I4f1129e155e2602299394b5866165260f4ea0df8
story: 2002751
task: 24870
2ab874a5be