* tools/dist/release.py: Python3 compatibility fixes.

The 'clean-dist' subcommand was broken, doing nothing.
The 'write-changelog' subcommand was lacking some blank lines.
The Python '2to3' utility suggested these particular fixes (and also made
some bad suggestions).


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1883663 13f79535-47bb-0310-9956-ffa450edef68
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