test: metadata: Improve test coverage
test: metadata: Improve test coverage

Test also the TITLE and DESCRIPTION metadata types.

datto/libvirt,andreabolognani/libvirt,zippy2/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,agx/libvirt,shugaoye/libvirt,elmarco/libvirt,nertpinx/libvirt,andreabolognani/libvirt,jardasgit/libvirt,elmarco/libvirt,taget/libvirt,VenkatDatta/libvirt,rlaager/libvirt,elmarco/libvirt,datto/libvirt,rlaager/libvirt,fabianfreyer/libvirt,rlaager/libvirt,agx/libvirt,agx/libvirt,taget/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,datto/libvirt,VenkatDatta/libvirt,taget/libvirt,elmarco/libvirt,libvirt/libvirt,libvirt/libvirt,nertpinx/libvirt,agx/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,shugaoye/libvirt,jardasgit/libvirt,datto/libvirt,zippy2/libvirt,nertpinx/libvirt,zippy2/libvirt,taget/libvirt,fabianfreyer/libvirt,olafhering/libvirt,olafhering/libvirt,libvirt/libvirt,taget/libvirt,andreabolognani/libvirt,datto/libvirt,crobinso/libvirt,eskultety/libvirt,rlaager/libvirt,jardasgit/libvirt,agx/libvirt,libvirt/libvirt,nertpinx/libvirt,olafhering/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,andreabolognani/libvirt,eskultety/libvirt,rlaager/libvirt,zippy2/libvirt,elmarco/libvirt,jardasgit/libvirt,eskultety/libvirt,shugaoye/libvirt,olafhering/libvirt,andreabolognani/libvirt,eskultety/libvirt,shugaoye/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,eskultety/libvirt,VenkatDatta/libvirt,crobinso/libvirt,crobinso/libvirt,crobinso/libvirt,jfehlig/libvirt