eol: update isbinary filter to work without compat wrapper

localrepo: fix variable binding in handling of old filters The lambda was referencing oldfn in outer scope without binding the current value. If oldfn function were reassigned before use, wrong filters could be used. Fixed by having oldfn as named parameter default value of the lambda.

localrepo: debug log of filter name when filtering through a function

eol: test-eol-update.t coverage around update --clean using filters ... badly This will reveal problems and track their fixes.