[webapi] Remove Vehicle info ZonePosition attributes and update VehicleInterface

- Since ZonePosition attributes not exist in Zone according to new spec, So reomve these attributes test
- availabilityChangedListener and removeAvailabilityChangedListener in tizen.vehicle.vehicleSpeed

Impacted TCs num(approved): New 5, Update 2, Delete 19
Unit test Platform: Tizen IVI
Tizen test result summary: Pass 4, Fail 25, Blocked 0
Merge pull request #980 from xinliux/xinliux/webapi/vehicleinfo-zone

[webapi] Remove Vehicle info ZonePosition attributes and update VehicleI...