etcd: enable v2 api only if needed (#8001)
* etcd: enable v2 api only if needed Only enable v2 API if we have a consumer (flannel) This reduce the exposed surface for etcd. * Fix bad group name
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* etcd: enable v2 api only if needed Only enable v2 API if we have a consumer (flannel) This reduce the exposed surface for etcd. * Fix bad group name
mentioned in commit 88c11b59