[VOL-1460]

- Imported protobuf definitions from pyvoltha at
  https://gerrit.opencord.org/gitweb?p=pyvoltha.git, commit hash:
  944aee71301b8ddb211b6e51d685f56d5c4a911b

- Imported upstream Google API protos from
  https://github.com/googleapis/googleapis, commit hash:
  5a90fbea68ce4a6e87c20d2df10df5ecd88299ff

- Fixed `import` paths and directory heirarchy in protobuf definitions
  to be compatible with both python 2 and 3.

- Created Makefile scaffold to generate language-specific bindings for
  python and go

Change-Id: Idd6b6b985a5eae4c38d40dd07ae78744c09e37f5
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f24c7c4
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,17 @@
+# python related
+*.pyc
+*.egg-info
+dist
+build
+.tox
+venv_protos
+
+# generated files that shouldn't be committed
+*_pb2.py
+*_pb2_grpc.py
+*.desc
+
+# tesing related
+.coverage
+*coverage.xml
+*results.xml