This is related to #294

After upgrading google-api-python-client and oauth2client I get:

Oct 23 11:26:30 admin [11:26:30][WARNING] googleapiclient.discovery_cache init.py:autodetect:44 | file_cache is unavailable when using oauth2client >= 4.0.0#012Traceback (most recent call last):#12 File "/usr/share/python/.../local/lib/python2.7/site-packages/googleapiclient/discovery_cache/init.py", line 41, in autodetect#012 from . import file_cache#012 File "/usr/share/python/..../local/lib/python2.7/site-packages/googleapiclient/discovery_cache/file_cache.py", line 41, in #12 'file_cache is unavailable when using oauth2client >= 4.0.0')#012ImportError: file_cache is unavailable when using oauth2client >= 4.0.0

I know that it was added to add oauth2client support (which I appreciate) and from what I can see doesn't actually abort any action - but would it be possible to remove the WARNING as well - or is it meant as a future todo?

It's not a huge issue, but possibly confusing to others - not to mention my eyes stopping at it every time I view any logs or monitoring.