fix: make stop_without_zone_id conditional on fare rule type

[krnlmstrd]

Summary:

Resolves #1663 by updating StopZoneIdValidator to issue notice about a stop without zone_id defined only when the stop is contained in a trip contained in a route defined in a fare rule with zone fields defined. Change from previous logic which warned about stops without zone_id defined if any fare rules had zone fields defined.

• The warning is still only triggered for stops where location_type is 0.
• Zone fields in fare_rules.txt are origin_id, destination_id, and contains_id.
• Adds tests to StopZoneIdValidatorTest to confirm expected behavior as described below.

Expected behavior:

If a stop of location_type 0 does not have a zone_id defined, and that stop is defined as part of a trip in stop_times.txt, and that trip is defined as part of a route in trips.txt, and that route is defined in a fare rule in fare_rules.txt, and that fare rule has any of origin_id, destination_id, or contains_id defined, then a stop_without_zone_id notice is issued.

Exactly one notice is issued per stop that meets the criteria to issue a notice even if that stop meets the notice criteria through multiple combinations of trips, routes, and fare rules.

The notice is never issued if a stop has a zone_id defined, even if that zone_id is never defined in a zone field of a fare rule associated with the stop by the (stop_time > trip > route) chain described above.

This pull request fixes the issue on the test feed provided by westontrillium in google/transit #429.

Validator results on test feed without fix:

Validator results on test feed with fix:

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[krnlmstrd]

I closed this pull request and deleted the fork because of issues with the email written into my commits and CLAassistant, and I submitted a (nearly) identical pull request.