Review Request 54220: Made the agent's `api/v1` handler handle request streaming.

[Anand Mazumdar]

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Review request for mesos and Vinod Kone.


Bugs: MESOS-6472
    https://issues.apache.org/jira/browse/MESOS-6472


Repository: mesos


Description
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This lays the ground work for adding the attach container input
call later.


Diffs
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  src/common/http.hpp 378208be58d0cd141ff60a6d25a173f2793870dc 
  src/common/http.cpp 42af33094150001fa6741effb6b0aee1cde3c109 
  src/slave/http.cpp 87189dd6e2e099cb74faabd3ad26aaca11e5cef2 
  src/slave/slave.hpp 05865a09724f7a46e9c06b02e59779513fc532aa 

Diff: https://reviews.apache.org/r/54220/diff/


Testing
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make check (tests would be added later in the chain)


Thanks,

Anand Mazumdar