Re: [jclouds] Set Content-MD5 only if ETag has correct format (#493)

[Andrew Gaul]

Pushed to master as df996f3231005b1ef294223d20efbabe74a23de7 and 1.8.x as 
f2d897d9774c2c0225c199c7f2f46971637327d6.

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https://github.com/jclouds/jclouds/pull/493#issuecomment-53837257