Incur setuptools as an dependency for grpcio_tools
diff --git a/tools/distrib/python/grpcio_tools/setup.py b/tools/distrib/python/grpcio_tools/setup.py
index d48ad32..164088b 100644
--- a/tools/distrib/python/grpcio_tools/setup.py
+++ b/tools/distrib/python/grpcio_tools/setup.py
@@ -232,6 +232,7 @@
     install_requires=[
         'protobuf>=3.5.0.post1, < 4.0dev',
         'grpcio>={version}'.format(version=grpc_version.VERSION),
+        'setuptools',
     ],
     package_data=package_data(),
 )