[release-0.7]Fix: health probe config should be port-specific

[MartinForReal]

What type of PR is this?

/kind bug
/kind feature

What this PR does / why we need it:

backport pr963 to release-1.0

Which issue(s) this PR fixes:

Fixes #949 #948

Special notes for your reviewer:

Please pay special attention to changes in loadbalancer_test.go because it may introduce break change.

Does this PR introduce a user-facing change?

Following  configuration will be applied to the all ports of service.

"service.beta.kubernetes.io/azure-load-balancer-health-probe-protocol"
"service.beta.kubernetes.io/azure-load-balancer-health-probe-interval"
"service.beta.kubernetes.io/azure-load-balancer-health-probe-num-of-probe"
"service.beta.kubernetes.io/azure-load-balancer-health-probe-request-path"

If health probe is needed, user should specify AppProtocol in port object of Service spec.
And following protocols are supported: http, tcp, https

Additional annotations are added. where port is the port number of port object

service.beta.kubernetes.io/port_{port}_health-probe_interval
service.beta.kubernetes.io/port_{port}_health-probe_num-of-probe
service.beta.kubernetes.io/port_{port}_health-probe_request-path

Please refer to docs.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

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[MartinForReal]

/assign @feiskyer

[MartinForReal]

/retest

[nilo19]

/lgtm