* With google provider 1.2, target pool instances can use self_link
and zone/name formats without causing a diff on each plan
* Original workaround: 77fc14db71
* Change controllers from a managed group to individual instances
* Create discrete DNS records to each controller's private IP for etcd
* Change etcd to run on-host, across controllers (etcd-member.service)
* Reduce time to bootstrap a cluster
* Deprecate self-hosted-etcd on the Google Cloud platform