Review Request 34371: Add framework's pid to json summary of framework.

[Joris Van Remoortere]

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Review request for mesos and Benjamin Hindman.


Bugs: MESOS-2746
    https://issues.apache.org/jira/browse/MESOS-2746


Repository: mesos


Description
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Following pattern of slave exposing its pid.


Diffs
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  src/master/http.cpp 7fa47a9fa2f5667631169876964dccf7fdcc172e 

Diff: https://reviews.apache.org/r/34371/diff/


Testing
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make check.


Thanks,

Joris Van Remoortere