*: enable cluster-etcd-operator

[hexfusion]

Currently, we use the presence/existence of the clusterEtcdOperatorImageKey flag value and the value of the clusterEtcdOperatorImage [1] [2] as a condition for using the old style SRV bootstrap or enable cluster-etcd-operator to scale etcd. This PR would enable 4.3 scaling for MCO.

• https://github.com/openshift/machine-config-operator/blob/release-4.3/templates/master/00-master/_base/files/etc-kubernetes-manifests-etcd-member.yaml#L22

• https://github.com/openshift/machine-config-operator/compare/master...hexfusion:enable_ceo?expand=1#diff-cbbafda65814e4ab5960f98e6b8c109fR14

[hexfusion]

/hold

We don't want this to merge until we are ready with installer PR.

[alaypatel07]

/lgtm

apart from the hold, this lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: alaypatel07, hexfusion
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[kikisdeliveryservice]

Required installer pr: openshift/installer#2608

[kikisdeliveryservice]

/skip

[openshift-ci-robot]

@hexfusion: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws-scaleup-rhel7	4b04763	link	/test e2e-aws-scaleup-rhel7
ci/prow/e2e-aws	4b04763	link	/test e2e-aws
ci/prow/e2e-gcp-op	4b04763	link	/test e2e-gcp-op
ci/prow/e2e-gcp-upgrade	4b04763	link	/test e2e-gcp-upgrade

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[hexfusion]

We will try this again in 4.4