Build grpcio-tools sdist

tools/run_tests/build_artifact_python.sh

@@ -59,7 +59,11 @@ ${SETARCH_CMD} ${PYTHON} setup.py  \
 ${SETARCH_CMD} ${PYTHON} setup.py  \
     bdist_wheel
 
-# Build gRPC tools package
+# Build gRPC tools package source distribution
+${SETARCH_CMD} ${PYTHON} tools/distrib/python/grpcio_tools/setup.py  \
+    sdist
+
+# Build gRPC tools package binary distribution
 ${PYTHON} tools/distrib/python/make_grpcio_tools.py
 CFLAGS="$CFLAGS -fno-wrapv" ${SETARCH_CMD} \
   ${PYTHON} tools/distrib/python/grpcio_tools/setup.py bdist_wheel