Disable some URI tests on older libxml2
Disable some URI tests on older libxml2

Older versions of libxml2 could not correctly parse certain
URIs. This causes test failures. There's nothing libvirt can
do about this, so disable the problem tests on old libxml2
versions

Signed-off-by: Daniel P. Berrange <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

jardasgit/libvirt,VenkatDatta/libvirt,agx/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,rlaager/libvirt,taget/libvirt,jardasgit/libvirt,libvirt/libvirt,cbosdo/libvirt,cbosdo/libvirt,zippy2/libvirt,crobinso/libvirt,cbosdo/libvirt,eskultety/libvirt,taget/libvirt,zhlcindy/libvirt-1.1.4-maintain,fabianfreyer/libvirt,elmarco/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,datto/libvirt,VenkatDatta/libvirt,libvirt/libvirt,shugaoye/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,nertpinx/libvirt,elmarco/libvirt,rlaager/libvirt,datto/libvirt,andreabolognani/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,shugaoye/libvirt,crobinso/libvirt,olafhering/libvirt,elmarco/libvirt,jardasgit/libvirt,nertpinx/libvirt,jfehlig/libvirt,taget/libvirt,zippy2/libvirt,fabianfreyer/libvirt,datto/libvirt,agx/libvirt,zhlcindy/libvirt-1.1.4-maintain,jardasgit/libvirt,zhlcindy/libvirt-1.1.4-maintain,zhlcindy/libvirt-1.1.4-maintain,eskultety/libvirt,zippy2/libvirt,fabianfreyer/libvirt,rlaager/libvirt,cbosdo/libvirt,crobinso/libvirt,nertpinx/libvirt,elmarco/libvirt,shugaoye/libvirt,eskultety/libvirt,eskultety/libvirt,olafhering/libvirt,taget/libvirt,shugaoye/libvirt,libvirt/libvirt,libvirt/libvirt,agx/libvirt,zippy2/libvirt,crobinso/libvirt,VenkatDatta/libvirt,rlaager/libvirt,agx/libvirt,agx/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,datto/libvirt,olafhering/libvirt,cbosdo/libvirt,jfehlig/libvirt,jardasgit/libvirt,taget/libvirt,nertpinx/libvirt,jfehlig/libvirt,elmarco/libvirt,datto/libvirt,shugaoye/libvirt,rlaager/libvirt,eskultety/libvirt,olafhering/libvirt,jfehlig/libvirt