Silence oauth2client tracebacks when using Google Cloud Speech API

[akabraham]

If you're using the latest version of google-api-python-client (1.6.2) which uses oauth2client 4.0.0, then you will see these tracebacks on every call to recognize_google_cloud()

2017-04-26 01:09:47,839 WARNING -- __init__.py:44 -- file_cache is unavailable when using oauth2client >= 4.0.0
Traceback (most recent call last):
  File "/home/ubuntu/.virtualenvs/v/lib/python3.4/site-packages/googleapiclient/discovery_
cache/__init__.py", line 36, in autodetect
    from google.appengine.api import memcache
ImportError: No module named 'google'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ubuntu/.virtualenvs/v/lib/python3.4/site-packages/googleapiclient/discovery_
cache/file_cache.py", line 33, in <module>
    from oauth2client.contrib.locked_file import LockedFile
ImportError: No module named 'oauth2client.contrib.locked_file'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ubuntu/.virtualenvs/v/lib/python3.4/site-packages/googleapiclient/discovery_
cache/file_cache.py", line 37, in <module>
    from oauth2client.locked_file import LockedFile
ImportError: No module named 'oauth2client.locked_file'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/ubuntu/.virtualenvs/v/lib/python3.4/site-packages/googleapiclient/discovery_
cache/__init__.py", line 41, in autodetect
    from . import file_cache
  File "/home/ubuntu/.virtualenvs/v/lib/python3.4/site-packages/googleapiclient/discovery_
cache/file_cache.py", line 41, in <module>
    'file_cache is unavailable when using oauth2client >= 4.0.0')
ImportError: file_cache is unavailable when using oauth2client >= 4.0.0

This is a known issue on Google's end. There was a suggested fix from googleapis/google-api-python-client#299 that I've applied here. No more tracebacks as a result!

[Uberi]

Thanks for the patch and write-up, @akabraham!