extract_excuses.py: update to use yaml instead of parsing html

Paul Geversrequested to merge
elbrus/qa:rewrite-extract_excuses-to-use-yaml into master

How small annoyances result in a large MR.

I wanted to fix the link to Dependencies in the excuses.php file and ended up converting the script to use the yaml instead of parsing the html page.

I converted it to python3 to be future ready.

I tested it now up-to reading back the database. So URL code now works after my initial failure.

Edited by Paul Gevers

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