Update the airport tag to use the standard aeroway=aerodrome
Update the airport tag to use the standard aeroway=aerodrome

Update the airport tag to use the standard aeroway=aerodrome instead
of the amenity=airport as pointed out on potlatch-dev mailing list.

tillmo/do-roam,tillmo/do-roam,tillmo/do-roam,tillmo/do-roam,tillmo/do-roam,tillmo/do-roam