[release-1.1] Add servie annotation to disable lb floating ip

[nilo19]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Cherry pick of #1729: Add servie annotation to disable lb floating ip

Which issue(s) this PR fixes:

Fixes #1659

Special notes for your reviewer:

Does this PR introduce a user-facing change?

A new service annotation `service.beta.kubernetes.io/azure-disable-load-balancer-floating-ip` has been added to disable floating IPs in load balancer rule. 

If annotation is omitted or if the annotation is set to be "false", then floating IP will be enabled.
If the annotation is set to be "true", then floating IP will be disabled.

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

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nilo19

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[MartinForReal]

/lgtm