Cherry-Pick #1092 [Add support for Port to BackendConfig HealthCheckConfig] to release-1.9

[spencerhance]

#1092
[Wire in support to override the Port of a HealthCheck via BackendConfig.
This also forces the PortSpecification to be "USE_FIXED_PORT" regardless
of what type the health check is (e.g. neg, ilb etc.)]

[k8s-ci-robot]

Hi @spencerhance. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[spencerhance]

/assign @bowei

[spencerhance]

/assign @freehan

[rramkumar1]

/ok-to-test

[spencerhance]

@bowei @freehan Can we merge this?

[freehan]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: freehan, spencerhance

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