ARROW-404: [Python] Fix segfault caused by HdfsClient getting closed before an HdfsFile#230

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Commits on Dec 7, 2016

Ensure that HdfsClient does not get closed before an open file does when the last user-accessible client reference goes out of scope
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amend comment
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Commits on Dec 8, 2016

Use weakref in _HdfsFileNanny to avoid cyclic gc
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