Review Request: Factored out realpath, used to construct path for 'mesos-executor'.

[Benjamin Hindman]

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https://reviews.apache.org/r/4372/
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Review request for mesos and John Sirois.


Summary
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See summary.


Diffs
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  src/common/utils.hpp 467f12b 
  src/slave/slave.hpp bf01aef 
  src/tests/main.cpp c42264f 

Diff: https://reviews.apache.org/r/4372/diff


Testing
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make check


Thanks,

Benjamin