Validator complains about key: *:lanes:conditional (etc.)

[alv]

Since r6605 (see #9350) the validator has a too strict parser for any keys with the :conditional suffix. The conditional restrictions must be valid when combined with ":lanes" suffix, too?

e.g.:

goods:lanes:conditional =

yes @ (Mo-Fr 09:00-15:00, 18:00-07:00; Sa-Su 24h)

(rightmost (bus) lane allowed for vans in the given timeframe. It could have :forward or :backward in the key, too. Also similar keys for other access modes. Example way: ​http://www.openstreetmap.org/way/29689100)

We also use:
traffic_sign:conditional = FI:361[100] @ (winter)
yet the validator complains about it. (They physically change the maxspeed sign for the winter.)

Another user ij_ wrote the attached patch, which fixes the test when ":lanes" is present in the key, and at least it compiled ok.