ReachableAddresses applied too broadly

The ReachableAddresses filter should only apply when picking a first node. But in 268608c in #17840 (moved) , it began to apply to the whole path.

This is bad for path selection, in proportion to the restrictiveness of your ReachableAddresses filter. It's probably not a hard break, but it's important to fix.

Teor found this issue and wrote a patch for it. It should go into an 028 release.