chutney should try harder to find a stable/different version of tor
Currently, chutney tries to find a stable version of tor under tor-stable anywhere in the path, then stops.
We could:
- Preserve the old path before test-network.sh modifies it, and use the first tor in that path
- Check for /usr/bin/tor and /usr/local/bin/tor (And maybe /opt ?)
- use each version in a round-robin fashion (Split to #17014 (moved), child of #16954 (moved))