Adds Managed APIServer Loadbalancer#401

Merged

k8s-ci-robot merged 3 commits intokubernetes-sigs:masterfrom

sbueringer:pr-add-managed-apiserver-lb

Aug 1, 2019

Commits on Jul 29, 2019

Adds Managed APIServer Loadbalancer
sbueringer
committed

Commits on Jul 30, 2019

add check for lb member
sbueringer
committed

Commits on Jul 31, 2019

fix panic
sbueringer
committed