qemu: blockjob: Add flag for invalid block job data
qemu: blockjob: Add flag for invalid block job data

The job data saved in the XML may be partially invalid e.g. if something
is missing. To prevent losing a domain with such a job add a flag to the
job data so that job APIs can ignore such a job and we can just cancel
it.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Ján Tomko <4cab11cfb98d3c937327354a78eb07dbb6ee2bc6@redhat.com>

nertpinx/libvirt,libvirt/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,libvirt/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,zippy2/libvirt,libvirt/libvirt,jardasgit/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,olafhering/libvirt,eskultety/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,eskultety/libvirt,crobinso/libvirt,zippy2/libvirt,zippy2/libvirt,jardasgit/libvirt,andreabolognani/libvirt,eskultety/libvirt,jardasgit/libvirt,eskultety/libvirt,crobinso/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,eskultety/libvirt,olafhering/libvirt,andreabolognani/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,jfehlig/libvirt,andreabolognani/libvirt,zippy2/libvirt,crobinso/libvirt,libvirt/libvirt,olafhering/libvirt,crobinso/libvirt,jfehlig/libvirt,jfehlig/libvirt,nertpinx/libvirt,olafhering/libvirt