planning: a fix in ScenarioManager for yield_sign
planning: a fix in ScenarioManager for yield_sign

wanglei828/apollo,xiaoxq/apollo,jinghaomiao/apollo,ApolloAuto/apollo,ApolloAuto/apollo,jinghaomiao/apollo,ycool/apollo,xiaoxq/apollo,ycool/apollo,jinghaomiao/apollo,jinghaomiao/apollo,ycool/apollo,jinghaomiao/apollo,xiaoxq/apollo,ApolloAuto/apollo,wanglei828/apollo,jinghaomiao/apollo,ApolloAuto/apollo,wanglei828/apollo,ycool/apollo,xiaoxq/apollo,wanglei828/apollo,wanglei828/apollo,ycool/apollo,xiaoxq/apollo,ApolloAuto/apollo,wanglei828/apollo,ApolloAuto/apollo,xiaoxq/apollo,ycool/apollo