Fix kustomization template to work with cert-manager

[dbaker-rh]

A few changes in this PR:
1/ Make use of cert-manager's selfSigned{} to bootstrap the actual CA creation (removes the need for a manual openssl step)
2/ Update grpc_health_check to use TLS (without this, the master pod won't start)
3/ Update the certs to include "localhost" in the SAN list, so grpc_health_check can work
4/ Update docs (and bump cert-manager referenced to 1.6.1)

Note - this is partly in response to #563

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[marquiz]

Nice work @dbaker-rh!

Now that the manual steps of creating the ca cert are eliminated maybe we could even make this a component under deployment/components/. WDYT?

/ok-to-test

[marquiz]

Looks good 👍 If you could squash this into one commit I think we could merge this

[dbaker-rh]

squished!

[marquiz]

probes.yaml disappeared in the latest force push 🤓

[dbaker-rh]

Sorry. I did a before/after diff and missed it. Re-uploaded a commit.

[marquiz]

Very welcome improvement @dbaker-rh 😊
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dbaker-rh, marquiz

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