add missing apimodel cli parameter description (#3740) (#3775)
add missing apimodel cli parameter description (#3740) (#3775)


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