Retire old test link

[waqarz]

This link is down
MANIFEST VALIDATORS
ITEC– available at https://www-itec.uni-klu.ac.at/dash/?page_id=605, the validator offers the possibility to validate DASH manifest files. This can either be done via file upload, URL or direct input of the description. Furthermore, the validator checks not only schema compliance but also semantic compliance of a description as specified in the corresponding parts of the standard.
At
https://dashif.org/software/

We should remove this old MPD validator link since DASH-IF's MPD validator is based on this quite old version and adds lots of new functions.