WIP: server/etcdmain: add configurable cipher list to gRPC proxy listener

[dusk125]

This will end up at upstream, but I want to test in Openshift before opening upstream.

[openshift-ci]

@dusk125: No Bugzilla bug is referenced in the title of this pull request.
To reference a bug, add 'Bug XXX:' to the title of this pull request and request another bug refresh with /bugzilla refresh.

In response to this:

WIP: server/etcdmain: add configurable cipher list to gRPC proxy listener

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[openshift-ci]

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[dusk125]

Test procedure:

1. oc get pods -n openshift-etcd
2. Pick an etcd node
3. oc exec -it -n openshift-etcd pod/<step-2-pod> -c etcd-metrics -- /bin/bash
4. wget "https://github.com/drwetter/testssl.sh/releases/tag/v3.0.7" (or more recent version)
5. tar -zxf <step-4-file>
6. cd <step-5-dir>
7. ./testssl.sh --sweet32 localhost:9979

You should see the following, not vulnerable is what we want.

[openshift-ci]

@dusk125: The following tests 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-serial	0948b56	link	true	/test e2e-aws-serial
ci/prow/configmap-scale	0948b56	link	true	/test configmap-scale

Full PR test history. Your PR dashboard.

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