Review Request: Fixed the slave to do disk usage calculations on the filesystem on which the slave work directory is mounted.

[Vinod Kone]

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https://reviews.apache.org/r/10661/
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Review request for mesos, Benjamin Hindman and Ben Mahler.


Description
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See summary.


Diffs
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  src/slave/slave.cpp a84ef902bfabe6cb70bb7001e895f89fec0c694e 

Diff: https://reviews.apache.org/r/10661/diff/


Testing
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make check


Thanks,

Vinod Kone