usrloc: use contact id in update replicated msg
This commit also sends the contact_id in a replicated update packet.
This is useful when the instance that receives the replicated update
does not have the actual contact (it previously expired), and needs to
treat the update as an insert - before this patch insert would have
generated a new contact_id, possibly overlapping with another one
generated by the primary server.
(cherry picked from commit 7c13f2e7d89a8e5f297f0d29faa047b1b1a5cb04)