add k8s v1.8.12 support (#2803)
add k8s v1.8.12 support (#2803)


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