Clarify that connections to EPP should use TLS by default

[robscott]

This is intended to clarify the default expectation of using TLS when Gateways are connecting to Endpoint Picker(s). This matches the default mode of Endpoint Picker. While it leaves room for configuration of plain-text or other protocols altogether, I think it's sensible for the default behavior here to rely on TLS.

Thanks to @aslakknutsen for raising this as he was reviewing conformance tests earlier. Our conformance tests made this assumption of default behavior without any corresponding guidance in the API spec. This PR intends to resolve that.

/cc @danehans @LiorLieberman @aslakknutsen @zetxqx

[k8s-ci-robot]

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In response to this:

This is intended to clarify the default expectation of using TLS when Gateways are connecting to Endpoint Picker(s). This matches the default mode of Endpoint Picker. While it leaves room for configuration of plain-text or other protocols altogether, I think it's sensible for the default behavior here to rely on TLS.

Thanks to @aslakknutsen for raising this as he was reviewing conformance tests earlier. Our conformance tests made this assumption of default behavior without any corresponding guidance in the API spec. This PR intends to resolve that.

/cc @danehans @LiorLieberman @aslakknutsen @zetxqx

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[zetxqx]

/lgtm

Thanks @robscott . Just a nit, probably b/c my change is just merged.

[k8s-ci-robot]

@zetxqx: changing LGTM is restricted to collaborators

In response to this:

/lgtm

Thanks @robscott . Just a nit, probably b/c my change is just merged.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[LiorLieberman]

looks good to me, added one nit

[ahg-g]

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahg-g, LiorLieberman, robscott

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