qemu: Fix job handling in qemuDomainSetMetadata
qemu: Fix job handling in qemuDomainSetMetadata

The code modifies the domain configuration but doesn't take a MODIFY
type job to do so.

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