Update to account for import error in generated python code

[dray92]

After generating relevant server/client code for python, the presence of

from google.api import annotations_pb2 as google_dot_api_dot_annotations__pb2

causes,

    from google.api import annotations_pb2 as google_dot_api_dot_annotations__pb2
ImportError: No module named api

pip install grpcio-tools only brings in google/protobuf module.

Installing googleapis-common-protos causes the required files, specifically,
google/api/annotations_pb2.py to be pulled in, thus resolving the import error.

There are examples like python-grpc-hack.sh out there, which is basically hacking
around the absence of the required module. I have not yet tried the Java codegen yet
but till the relevant protoc changes are pushed upstream, this change seems to be
the path of least resistance.
What are your thoughts around this?

Related issue: #298.

Signed-off-by: Debosmit Ray [email protected]

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[hsaliak]

@debosmit would you be OK with signing the CLA? without it, we cannot merge the PR.

[hsaliak]

Thank you for the contribution!