Review Request 36824: Used std::thread instead of pthread for ns tests.

[Joris Van Remoortere]

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Review request for mesos, Benjamin Hindman, Artem Harutyunyan, and Michael Park.


Bugs: MESOS-3120
    https://issues.apache.org/jira/browse/MESOS-3120


Repository: mesos


Description
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See summary.


Diffs
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  src/tests/containerizer/ns_tests.cpp c71c33fa1247d1658be91ce81c93bfffd5b282b7 

Diff: https://reviews.apache.org/r/36824/diff/


Testing
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sudo ./bin/mesos-tests.sh --gtest_filter="NsTest.*"


Thanks,

Joris Van Remoortere