kernel-interface: Raise expires with a proto/SPI/dst tuple instead of reqid
inactivity-job: Schedule job by CHILD_SA unique ID instead of reqid
kernel-interface: Raise mapping event with a proto/SPI/dst tuple
migrate-job: Do CHILD_SA reqid lookup locally
ike-sa-manager: Remove IKE_SA checkout by CHILD_SA reqid
unity: Reference IKE_SAs by the IKEv1 COOKIEs, improving lookup performance

When handling thousands of IKE_SAs, the unique ID based lookup is rather slow,
as we have no indexing.
ike: Consistently log CHILD_SAs with their unique_id instead of their reqid