R1:e6ddd6d0e95d

Cache Almanac URIs for repositories

Summary:
Ref T11954. This is kind of complex and I'm not sure I want to actually land it, but it gives us a fairly good improvement for clustered repositories so I'm leaning toward moving forward.

When we make (or receive) clustered repository requests, we must first load a bunch of stuff out of Almanac to figure out where to send the request (or if we can handle the request ourselves).

This involves several round trip queries into Almanac (service, device, interfaces…