[docs] [issue10818] pydoc: refactorize duplicate DocHandler and DocServer classes

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

I opened this issue because I had to fix a bug twice in pydoc: r87687 (fix a ResourceWarning(unclosed socket)).

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<http://bugs.python.org/issue10818>
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