qemu: snapshot: Check for block jobs individually
qemu: snapshot: Check for block jobs individually

If any disk of a VM was involved in a (copy) block job we refused to do
a snapshot. As not only copy jobs interlock snapshots and the
interlocking is applicable to individual disks only we can make the
check in a more individual fashion and interlock all block job types
supported by libvirt.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1203628

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