www/py-funkload: update to 1.17.1

• update to 1.17.1
• remove bogus py-xml dependency
• shorten COMMENT
• limit python version to 2.x
• update patch to setup.py to make it build (there is upstream issue [1])

[1] https://github.com/nuxeo/FunkLoad/issues/145

Approved by: lwhsu (maintainer, by email)