Stop checking routerinfos for addresses when we use microdescs for circuits
Directory mirrors and clients that FetchUselessDescriptors check for IPv4 and IPv6 addresses in the following order:
- routerinfos (descriptors)
- routerstatus (consensus)
- microdescriptors
But they should check using the following order:
- bridge routerinfos (descriptors)
- routerstatus (consensus) If using microdescriptors for circuits:
- microdescriptors Otherwise:
- routerinfos (descriptors)
There is code that implements this algorithm in commits decb0636e2, 1d1c927b9a, and 4979ec3c17 of my bug23975_tree branch.
But this adds overhead to every address lookup when building circuits.
Maybe we can make it faster by:
- not parsing routerinfos or microdescs if we aren't using them for circuits, or
- putting a canonical address in node_t, updating it whenever ri, rs, or md change, and always using it
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