qemuMigrationSrcConfirm: Don't remove domain config if confirm phase fails
qemuMigrationSrcConfirm: Don't remove domain config if confirm phase fails

If migration is cancelled or confirm phase fails the domain
should be kept on the source even if VIR_MIGRATE_UNDEFINE_SOURCE
was requested.

Signed-off-by: Michal Privoznik <83d82aaba2eed257f4814b0c239c260c4caaadf0@redhat.com>
Reviewed-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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