Req 2.2.1: Show host reservation status

This is a follow-up to req 2.2 (#45 (closed)) that asked for host reservations. This set of requirements outlined here require also getting lease information and correlating it with the host reservations:

• I would like to be able to sort this date the lease was assigned to a client.
• I would like to be able to apply a filter to show either all addresses assigned, or all host reservations not claimed.
• I would like to see if a lease for this reservation has actually been requested and assigned. #530 (closed)

The use case is, determining if there are configured host reservations not being used (I might remove them) or hosts that I expect to be using leases that are not on-line for some reason.