qemu: driver: Split out cancellation of migration from qemuDomainAbortJob
qemu: driver: Split out cancellation of migration from qemuDomainAbortJob

Following patch will refactor qemuDomainAbortJob to use a per-job-type
switch where we will need to abort a migration job in various branches.

Save some code duplication by introducing a helper.

Signed-off-by: Peter Krempa <2cf5c04c61aa466e4a47bfedc747d17279c72ffc@redhat.com>
Reviewed-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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