Made _tidy_route_slice cut rtt hops instead of all keys in route
Made _tidy_route_slice cut rtt hops instead of all keys in route

Issue: _tidy_route_slice was checking for unknown `*` entries in the
       route dictionary. When there were unknown entries for all ASN
       hops, it would cut down the traceroutes to the first hop even
       though IP/domains + RTT were found in subsequent hops.

Solution: Only checking for trailing RTT unknowns within the traceroute

spgreen/psTrace