etcd migrate: instead of scaleup playbook etcd server should be start… #7556
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…ed back
master doesn't need to be restarted and etcd URLs updated as new etcd
nodes are being added. There is no need to run scaleup playbook, as etcd
nodes are already added to the cluster.
The migrate procedure now does the following:
ETCD_INITIAL_CLUSTER_STATE
Now the only copy of migrated data is on the first etcd cluster, which
would replicate it to other nodes.
After migration is done master configs are updated and services
restarted if needed
(cherry picked from commit 7e30cda)