test: add timeout to regular xds test runs (#4201)
test: add timeout to regular xds test runs (#4201)


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