Review Request 61921: Added tests to ensure that tasks can access their parent's volumes.

[Gastón Kleiman]

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Review request for mesos and Greg Mann.


Bugs: MESOS-7916
    https://issues.apache.org/jira/browse/MESOS-7916


Repository: mesos


Description
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These tests verifies that sibling tasks can share a Volume owned by
their parent executor using 'sandbox_path' volumes.


Diffs
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  src/tests/default_executor_tests.cpp afe0afabf784fb65eb833beadd3c584722c321e1 


Diff: https://reviews.apache.org/r/61921/diff/1/


Testing
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`sudo bin/mesos-tests.sh --gtest_filter="*TasksSharingViaSandboxVolumes*" 
--gtest_repeat=500 --gtest_break_on_failure` on GNU/Linux.


Thanks,

Gastón Kleiman