Redo "Remove Loadbalancer interface and use k8s-cloud-provider mocks"

[spencerhance]

Redo of #781 now that vendor can be updated

[k8s-ci-robot]

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[spencerhance]

/hold cancel

[spencerhance]

@bowei @rramkumar1 Fixed the vendor update so this is good to go now

[rramkumar1]

/ok-to-test

[rramkumar1]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rramkumar1, spencerhance

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