Junru Shao created MXNET-1406:
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             Summary: [BUG] Fix DLManagedTensor deleter
                 Key: MXNET-1406
                 URL: https://issues.apache.org/jira/browse/MXNET-1406
             Project: Apache MXNet
          Issue Type: Improvement
            Reporter: Junru Shao


## Description ##
This PR fixes a bug that causes recent crash in DGL. Please refer to 
https://github.com/dmlc/dlpack/issues/39 for details.

CC: @zheng-da

## Checklist ##
### Essentials ###
Please feel free to remove inapplicable items for your PR.
- [x] The PR title starts with [MXNET-$JIRA_ID], where $JIRA_ID refers to the 
relevant [JIRA issue](https://issues.apache.org/jira/projects/MXNET/issues) 
created (except PRs with tiny changes)
- [x] Changes are complete (i.e. I finished coding on this PR)
- [x] All changes have test coverage:
- Unit tests are added for small changes to verify correctness (e.g. adding a 
new operator)
- Nightly tests are added for complicated/long-running ones (e.g. changing 
distributed kvstore)
- Build tests will be added for build configuration changes (e.g. adding a new 
build option with NCCL)
- [x] Code is well-documented: 
- For user-facing API changes, API doc string has been updated. 
- For new C++ functions in header files, their functionalities and arguments 
are documented. 
- For new examples, README.md is added to explain the what the example does, 
the source of the dataset, expected performance on test set and reference to 
the original paper if applicable
- Check the API doc at 
http://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$PR_ID/$BUILD_ID/index.html
- [x] To the my best knowledge, examples are either not affected by this 
change, or have been fixed to be compatible with this change

### Changes ###
- [x] Allow `MXNDArrayFromDLPack` to accept an additional flag indicating 
whether the handle will be freed before calling deleter.

## Comments ##
None



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