R1:57b4b5981947

When a Drydock host based on an Almanac blueprint has its binding disabled, stop handing out leases

Summary:
Ref T13210. Ref T12145. The "Almanac Host" blueprint currently hands out new leases on a given host even if the binding has been disabled.

Although there are some more complicated cases here (e.g., involving cleanup of the existing resource and existing leases), this one seems clear cut: if the binding has been disabled, we should stop handing out new leases on it.

Test Plan:
- Created a…