Log Message:
py-google-api-python-client: update to 1.6.7.

v1.6.7
  Version 1.6.7

  Bugfix release

  **Note**: The next release of this library will no longer directly depend on
    oauth2client. If you need to use oauth2client, you'll need to explicitly
    install it.

  - Make body optional for requests with no parameters. (#446)
  - Fix retying on socket.timeout. (#495)
  - Match travis matrix with tox testenv. (#498)
  - Remove oauth2client._helpers dependency. (#493)
  - Remove unused keyring test dependency. (#496)
  - discovery.py: remove unused oauth2client import. (#492)
  - Update README to reference GCP API client libraries. (#490)