Remove 308 from redirect codes for httplib2 0.16.0 compatibility

[jmakovicka]

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[shcheklein]

@jmakovicka good stuff, I think this is fixed in the maintained fork iterative/PyDrive2

[jmakovicka]

@shcheklein That's possible, I needed this one for Duplicity, which still depends on the original PyDrive.

[jmakovicka]

@googlebot I signed it!

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[shcheklein]

@jmakovicka makes sense, I doubt though a new version of this original PyDrive will be released soon. I hope I'm wrong.