ASF source release tarball has wrong directory name

[andygrove]

Describe the bug

Directory should be arrow-datafusion-python-0.7.0 not arrow-datafusion-0.7.0

A    arrow/arrow-datafusion-0.7.0/apache-arrow-datafusion-python-0.7.0.tar.gz
A    arrow/arrow-datafusion-0.7.0/apache-arrow-datafusion-python-0.7.0.tar.gz.asc
A    arrow/arrow-datafusion-0.7.0/apache-arrow-datafusion-python-0.7.0.tar.gz.sha256
A    arrow/arrow-datafusion-0.7.0/apache-arrow-datafusion-python-0.7.0.tar.gz.sha512

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Expected behavior
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Additional context
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[andygrove]

I fixed this manually in svn