[google compute] LIBCLOUD-657 add support for JSON private key format #438
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Google has introduced a new JSON formatted private key for Service Accounts. This PR adds support for the new format along with some improved handling of files vs strings for the key value. Docs have been updated to inform users Google prefers the JSON format versus legacy P12 format.
/cc @windo - This PR also includes the patch from Siim Poder via LIBCLOUD-627 to fix auth with Python 3.
Manual testing was done for the various file formats and using Python 2.7 and 3.2.
/cc @carlcrott since I broke you last time I touched GCE auth and if I do it again, he'll give me a 👊