BinaryPackagePublishingHistory._getOtherPublications fails to restrict the distroseries context

The recent Stormification of BinaryPackagePublishingHistory._getOtherPublications incorrectly said:

  BinaryPackagePublishingHistory.distroarchseries in available_architectures

This unobviously evaluates to True (possibly because Reference.__eq__ returns a Storm expression, which evaluates to True). The correct syntax is this:

  BinaryPackagePublishingHistory.distroarchseriesID.is_in(available_architectures)

The constant evaluation to True means that architecture-independent binary domination ignores the context series, dominating everything in the same archive, pocket and overrides. This indicates missing tests both before and after I rewrote them.