Revert "AUTH-323: remove rootCA from CA bundle for etcd certs"

[ibihim]

Reverts #1948

What

First of 2 PRs that try to fix CI by reverting the changes to the etcd certificates.
We need to first add the rootCA to the CA bundle of etcd, before removing the etcd-signer signed etcd certificates.

Why

The etcd peers can't talk to each other in HA mode. The reason is that the IP gets verified in addition to the DNS names.

This is the current working assumption.

[openshift-ci]

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[openshift-ci]

@ibihim: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws	6acc1f2	link	true	/test e2e-aws

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