tests: Ensure that there are no dead xlinks in DS.
tests: Ensure that there are no dead xlinks in DS.

This shall avoid broken documents like trac#286.

mpreisler/openscap,jan-cerny/openscap,ybznek/openscap,OpenSCAP/openscap,ybznek/openscap,redhatrises/openscap,openprivacy/openscap,openprivacy/openscap,isimluk/openscap,mpreisler/openscap,Hexadorsimal/openscap,redhatrises/openscap,mpreisler/openscap,Hexadorsimal/openscap,isimluk/openscap,Hexadorsimal/openscap,ybznek/openscap,postfix/openscap,jan-cerny/openscap,jan-cerny/openscap,OpenSCAP/openscap,openprivacy/openscap,jan-cerny/openscap,redhatrises/openscap,Hexadorsimal/openscap,openprivacy/openscap,Hexadorsimal/openscap,postfix/openscap,openprivacy/openscap,ybznek/openscap,isimluk/openscap,postfix/openscap,jan-cerny/openscap,postfix/openscap,openprivacy/openscap,OpenSCAP/openscap,jan-cerny/openscap,postfix/openscap,OpenSCAP/openscap,Hexadorsimal/openscap,isimluk/openscap,redhatrises/openscap,isimluk/openscap,OpenSCAP/openscap,mpreisler/openscap,postfix/openscap,ybznek/openscap,mpreisler/openscap,OpenSCAP/openscap,redhatrises/openscap,mpreisler/openscap,redhatrises/openscap,ybznek/openscap,isimluk/openscap