Add support for injecting the CA bundle into secrets

[mbaldessari]

This patch adds support for annotating secrets, so it becomes possible
to have CA bundles inside them. Some operators only allow looking up CAs
inside secrets (cert-manager being the most notable case), so adding
this support allows us to reference OCP's internal CA easily.

Tested as follows:

$ oc create secret generic test --from-literal=key1=bar
secret/test created
$ oc annotate secret test service.beta.openshift.io/inject-cabundle="true"
$ oc extract secret/test --keys=service-ca.crt --to=-
# service-ca.crt
-----BEGIN CERTIFICATE-----
MIIDUTCCAjmgAwIBAgIIZ6CJ/clzacAwDQYJKoZIhvcNAQELBQAwNjE0MDIGA1UE
Awwrb3BlbnNoaWZ0LXNlcnZpY2Utc2VydmluZy1zaWduZXJAMTY3MDMyNzk1MTAe
Fw0yMjEyMDYxMjAxMjJaFw0yNTAyMDMxMjAxMjNaMDYxNDAyBgNVBAMMK29wZW5z
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z8eCQ1gBgPzO6w32mGJlW322Cy05PeRgYt10bTTjCNdaRL6bCw==
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
MIIDUTCCAjmgAwIBAgIIVgXzfLvx0vAwDQYJKoZIhvcNAQELBQAwNjE0MDIGA1UE
Awwrb3BlbnNoaWZ0LXNlcnZpY2Utc2VydmluZy1zaWduZXJAMTY3MDMyNzk1MTAe
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5eskNOMyKnLZ0JpAfqXeLpqokMo+q1o4DyiDgXRd+6BvEcEzOg==
-----END CERTIFICATE-----

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mbaldessari
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[mbaldessari]

/retest-required

[openshift-ci]

@mbaldessari: all tests passed!

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[openshift-bot]

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/lifecycle stale

[stlaz]

/close
If there are operators that don't allow you to look up the CA in a configmap, fix those operators.

[openshift-ci]

@stlaz: Closed this PR.

In response to this:

/close
If there are operators that don't allow you to look up the CA in a configmap, fix those operators.

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