This commit fixes an issue when running the rest client and token
clients on python 3. httplib2 sets the type for the response body as
'bytes' when running on python 3, which requires that it be decoded
prior to running json.loads() on it. Additionally, in the v2 token
client a type check was done on the response body which was no longer
evaluating true because the type was no longer a 'str'. This was
fixed as part of the broader cleanup.
Change-Id: If4d496c4f10cec7d7050afc4b07f1f263de4c3e5
71bc71a4d2