cgit: osmo-commit-filter.py: migrate from deprecated cgi.escape to html.escape
Our error.log is full of:
/usr/local/lib/cgit/filters/osmo-commit-filter.py:18: DeprecationWarning: cgi.escape is deprecated, use html.escape instead
return '<a href="%s">%s</a>' % (url, cgi.escape(txt))
Change-Id: I97707519029d4f8d703d2df1b8beab15665d49b1
