updated VHDs for aks and aks-docker-engine distros (#4178)
updated VHDs for aks and aks-docker-engine distros (#4178)


jackfrancis/acs-engine,Azure/acs-engine,jackfrancis/acs-engine,Azure/acs-engine,jackfrancis/acs-engine,Azure/acs-engine,Azure/acs-engine,jackfrancis/acs-engine,Azure/acs-engine,jackfrancis/acs-engine