Re: [jclouds/jclouds] Remove Expect header for requests with empty body (#1120)

[Chaithanya Ganta]

@andrewgaul Please have a look at the Charles screenshot attached, where two 
calls are made in case of azure putBlob operation with zero length blob.

![charles1](https://user-images.githubusercontent.com/28896513/28322642-3d1b2142-6bf4-11e7-856e-1d3c00d6d9e2.png)

I've added a unit test case to check whether Expect header is stripped in the 
case of the empty request body.  Not sure how to add an integration test to 
actually check that only one network call is being made. Any leads on this 
would be very helpful. 


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