UTF-8 characters in url cause urlhash mismatch

[abulte]

When a resource URL holds some UTF-8 characters (eg https://raw.githubusercontent.com/etalab/format-commande-publique/master/schémas/xml/contrats-concessions.xsd), the urlhash computed by udata-piwik to try to find the resource does not match the one we have in DB. Probably because they are url-encoded in DB (eg https://raw.githubusercontent.com/etalab/format-commande-publique/master/sch%C3%A9mas/xml/contrats-concessions.xsd).

Fix: try to compute hash on an encoded url.

[abulte]

After a few tests, it seems encoding of UTF-8 characters is properly handled. This problem must be triggered by something else.