qemu_hotplug: move (Attach|Detach)Lease functions with others of same type
The Attach and Detach Lease functions were together in the middle of
the Detach functions. Put them at the end of their respective
sections, since they behave differently from the other attach/detach
functions (DetachLease doesn't use qemuDomainDeleteDevice(), and is
always synchronous).
Signed-off-by: Laine Stump <laine@laine.org> ACKed-by: Peter Krempa <pkrempa@redhat.com>