Review Request: Use Jvm::Attach in ZooKeeperServer::createTempDir(); CHECK() more JNI calls

[Charles Reiss]

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https://reviews.apache.org/r/3582/
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Review request for mesos.


Summary
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Adds missing Jvm::Attach to ZooKeeperServer::createTempDir().

Also checks the return value of JNI attach/detach calls.


This addresses bug MESOS-128.
    https://issues.apache.org/jira/browse/MESOS-128


Diffs
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  src/jvm/jvm.cpp 8f6e22b 
  src/tests/zookeeper_server.cpp 14c8f84 

Diff: https://reviews.apache.org/r/3582/diff


Testing
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Thanks,

Charles