update dcos link for azure china (#3033)
update dcos link for azure china (#3033)


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