tor/changes/feature9777

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o Major features:
- When we choose a path for a 3-hop circuit, make sure it contains
at least one relay that supports the NTor circuit extension
handshake. Otherwise, there is a chance that we're building
a circuit that's worth attacking by an adversary who finds
breaking 1024-bit crypto doable, and that chance changes the game
theory. Implements ticket 9777.