xds: workaround to deflake xds e2e tests (#4413)
xds: workaround to deflake xds e2e tests (#4413)


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