Review Request: Updated process::http::Response (and subclasses) to require more explicit distinction between an empty body and no body. Also put in place the foundation for streaming via pipes.

[Benjamin Hindman]

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https://reviews.apache.org/r/7542/
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Review request for mesos and Ben Mahler.


Description
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See summary.


Diffs
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  third_party/libprocess/include/process/http.hpp 
3d2922507bdb904e5bdebefbafb6ccae98c021c4 
  third_party/libprocess/src/encoder.hpp 
00e86610257b4956ceed13cd3e27e948ea53308e 

Diff: https://reviews.apache.org/r/7542/diff/


Testing
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make check


Thanks,

Benjamin Hindman