Review Request 43893: Made sure that all spawn processes have terminated before leaving test.

[Benjamin Bannier]

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Review request for mesos.


Bugs: MESOS-4747
    https://issues.apache.org/jira/browse/MESOS-4747


Repository: mesos


Description
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Made sure that all spawned processes terminate before leaving test.


Diffs
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  src/tests/container_logger_tests.cpp 6e2b8c1b80d4b49a1042c53945c223785d0d4a3f 

Diff: https://reviews.apache.org/r/43893/diff/


Testing
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make check
make check GTEST_FILTER=ContainerLoggerTest.MesosContainerizerRecover


Thanks,

Benjamin Bannier