Remove support for Nano's deprecated package names
Remove support for Nano's deprecated package names

This requires that all nano protos have .nano in their package name. The
support is expected to be removed from protobuf soon, since using the
deprecated package name causes problems.

pieterjanpintens/grpc-java,nmittler/grpc-java,grpc/grpc-java,rmichela/grpc-java,rmichela/grpc-java,elandau/grpc-java,carl-mastrangelo/grpc-java,carl-mastrangelo/grpc-java,stanley-cheung/grpc-java,LuminateWireless/grpc-java,zhangkun83/grpc-java,rmichela/grpc-java,grpc/grpc-java,carl-mastrangelo/grpc-java,stanley-cheung/grpc-java,pieterjanpintens/grpc-java,dapengzhang0/grpc-java,simonhorlick/grpc-java,ejona86/grpc-java,anuraaga/grpc-java,dapengzhang0/grpc-java,stanley-cheung/grpc-java,anuraaga/grpc-java,pieterjanpintens/grpc-java,simonhorlick/grpc-java,anuraaga/grpc-java,grpc/grpc-java,zhangkun83/grpc-java,grpc/grpc-java,louiscryan/grpc-java,zpencer/grpc-java,nmittler/grpc-java,dapengzhang0/grpc-java,ejona86/grpc-java,zpencer/grpc-java,carl-mastrangelo/grpc-java,elandau/grpc-java,simonhorlick/grpc-java,zhangkun83/grpc-java,elandau/grpc-java,zhangkun83/grpc-java,nmittler/grpc-java,dapengzhang0/grpc-java,elandau/grpc-java,zpencer/grpc-java,LuminateWireless/grpc-java,ejona86/grpc-java,ejona86/grpc-java,zpencer/grpc-java,stanley-cheung/grpc-java,pieterjanpintens/grpc-java,LuminateWireless/grpc-java,rmichela/grpc-java,simonhorlick/grpc-java,louiscryan/grpc-java,louiscryan/grpc-java