Review Request: Fixed a bug where we didn't expect a future to get discarded. We saw this in tests likely because the ordering of process termination was causing the isolation module to get cleaned up before the monitor.

[Benjamin Hindman]

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https://reviews.apache.org/r/9975/
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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/monitor.cpp 18fbd48f2b9759fc950e43a2c61f3d27119e24c7 

Diff: https://reviews.apache.org/r/9975/diff/


Testing
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make check


Thanks,

Benjamin Hindman