Review Request 44778: Moved flags parser for hashmap to stout [1/2].

[Kevin Klues]

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Review request for mesos and Ben Mahler.


Bugs: MESOS-4927
    https://issues.apache.org/jira/browse/MESOS-4927


Repository: mesos


Description
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Moved flags parser for hashmap<string, string> to stout [1/2].


Diffs
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  src/common/parse.hpp 9535fad0d50b469fbb4dc6ac5cf5c89b40d29b47 

Diff: https://reviews.apache.org/r/44778/diff/


Testing
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Ran `make` and `make check`


Thanks,

Kevin Klues