Review Request 16625: Cgroups cleanup() should wait for all attached subsystems to be detached.

[Jiang Yan Xu]

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https://reviews.apache.org/r/16625/
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Review request for mesos, Benjamin Hindman, Ben Mahler, and Vinod Kone.


Bugs: MESOS-891
    https://issues.apache.org/jira/browse/MESOS-891


Repository: mesos-git


Description
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- Otherwise the subsystems could still be attached when cleanup() exits and 
subsequent mount can fail.


Diffs
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  src/linux/cgroups.cpp 19ab1f348191ab0315271477b206aa8c6456fd5a 

Diff: https://reviews.apache.org/r/16625/diff/


Testing
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make check
./bin/mesos-tests.sh -j --gtest_filter=SlaveRecoveryTest/1.SchedulerFailover 
--gtest_repeat=100


Thanks,

Jiang Yan Xu