adopt signers from installer for rotating serving certs

[deads2k]

This doesn't wire us to serve with these new certs, but it does establish adoption of signing certs so we can rotate in the future.

/assign @sttts

To make this actually work, we need to turn the list of hostnames into a function and we need to re-sign when it changes.

[openshift-ci-robot]

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[deads2k]

/retest

[openshift-ci-robot]

@deads2k: The following test failed for commit cd9f74a, say /retest to rerun them:

Test name	Details	Rerun command
ci/prow/e2e-aws	link	/test e2e-aws

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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[deads2k]

adopting signers as discussed. ha proxy flake again.