Review Request: Fixed the Freezer to ignore proceses that go away while in the FREEZING state.

[Ben Mahler]

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https://reviews.apache.org/r/12019/
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Review request for mesos, Benjamin Hindman and Vinod Kone.


Description
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See the bug description.


This addresses bug MESOS-461.
    https://issues.apache.org/jira/browse/MESOS-461


Diffs
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  src/linux/cgroups.cpp 8d94fe63610c4c7a48f92d260fcd526b7a83942e 

Diff: https://reviews.apache.org/r/12019/diff/


Testing
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make check


Thanks,

Ben Mahler