Review Request 38319: Fixed an issue which caused Appc provisioner not to clean up the the container dir for its provisioned rootfses.

[Jiang Yan Xu]

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https://reviews.apache.org/r/38319/
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Review request for mesos, Jie Yu and Timothy Chen.


Bugs: MESOS-3415
    https://issues.apache.org/jira/browse/MESOS-3415


Repository: mesos


Description
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- Also changed the semantics of Provisioner::create() to fail with it fails to 
clean up unknown orphan containers.


Diffs
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  src/slave/containerizer/provisioners/appc/provisioner.cpp 
e177e3c2569c681a5fb8729bdb68e071b4e62ef1 
  src/slave/containerizer/provisioners/paths.hpp 
a2490885f28cf54a14b6de800700360b31827d88 
  src/slave/containerizer/provisioners/paths.cpp 
267912cfa0699167d204e6ade158e1523fcfd7a2 
  src/tests/containerizer/appc_provisioner_tests.cpp 
73c32c199804c5d2c48939ffd5d4885e4edf0fe8 

Diff: https://reviews.apache.org/r/38319/diff/


Testing
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make check.

Added a few checks in tests for this change.


Thanks,

Jiang Yan Xu