Review Request: Used 'Owned' instead of shared_ptr and cleaned up some formatting.

[Benjamin Hindman]

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https://reviews.apache.org/r/10110/
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Review request for mesos and Ben Mahler.


Description
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See summary.


Diffs
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  src/slave/slave.hpp 2529bf500a3265b10ad4cddde10c2d62a6cdb4a0 
  src/slave/slave.cpp 091ec5ed19924aef31b761e68b70b8d042f9a9b7 

Diff: https://reviews.apache.org/r/10110/diff/


Testing
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make check


Thanks,

Benjamin Hindman