add generation of python *grpc files

Signed-off-by: uwe ottrembka <uwe.ottrembka@adtran.com>
Change-Id: I2fcbfeb78e3aedd36d6122c055fdcbe7719756b0
diff --git a/.gitignore b/.gitignore
index 8eeec50..29486a6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -15,7 +15,7 @@
 
 # generated files that shouldn't be committed
 #*_pb2.py
-*_pb2_grpc.py
+#*_pb2_grpc.py
 *.desc
 
 # tesing related