Review Request: Fixed cgroup tests tear down to be more robust by using cgroups::destroy.

[Ben Mahler]

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/9790/
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Review request for mesos, Benjamin Hindman and Vinod Kone.


Description
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We observed some flakiness in terms of cleaning up the cgroups within the 
hierarchy.


Diffs
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  src/tests/cgroups_tests.cpp ed419eb174a095786fb6de9e181d42587e5b40e2 

Diff: https://reviews.apache.org/r/9790/diff/


Testing
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make check


Thanks,

Ben Mahler