Support for Azure VMSS, Cluster-Autoscaler and User Assigned Identity

Author: Krishnakumar R (KK) (Microsoft), Pengfei Ni (Microsoft) Introduction With Kubernetes v1.12, Azure virtual machine scale sets (VMSS) and cluster-autoscaler have reached their General Availability (GA) and User Assigned Identity is available as a preview feature. Azure VMSS allow you to creat…