Add etcd group support to rke role

Etcd cluster is now placed in members of kubernetes-etcd group instead
of kubernetes-node.
Due to defaults, it means infra is the only etcd
by default.

Change-Id: Iae05a42442849e4a248d73c2d78f5e2b0eae7255
Issue-ID: OOM-1778
Signed-off-by: Michal Zegan <m.zegan@samsung.com>
4 files changed