test: include xDS package in test client dependencies (#3407)
test: include xDS package in test client dependencies (#3407)


stanley-cheung/grpc-go,menghanl/grpc-go,stanley-cheung/grpc-go,grpc/grpc-go,dfawley/grpc-go,grpc/grpc-go,dfawley/grpc-go,menghanl/grpc-go