Add etcd readyz port

[hasbro17]

With openshift/cluster-etcd-operator#763 the etcd pods will be using port 9980 to serve the /readyz readiness endpoint.

[hasbro17]

/hold

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-ci]

@hasbro17: all tests passed!

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[deads2k]

/lgtm

[hasbro17]

/unhold

[openshift-bot]

Inactive enhancement proposals go stale after 28d of inactivity.

See https://github.com/openshift/enhancements#life-cycle for details.

Mark the proposal as fresh by commenting /remove-lifecycle stale.
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/lifecycle stale

[openshift-bot]

Stale enhancement proposals rot after 7d of inactivity.

See https://github.com/openshift/enhancements#life-cycle for details.

Mark the proposal as fresh by commenting /remove-lifecycle rotten.
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/lifecycle rotten
/remove-lifecycle stale

[openshift-bot]

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/close

[openshift-ci]

@openshift-bot: Closed this PR.

In response to this:

Rotten enhancement proposals close after 7d of inactivity.

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Reopen the proposal by commenting /reopen.
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/close

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