[cs615asa] Availability Zones of Volumes and Instances

[Tejas]

How is everyone handling this issue? I can check the zone of the 
instance and create a volume in that zone fine no issue. But if the user 
wants to use an existing volume and then creates a new instance there's 
no way in the design of ec2-start-instance to specify a zone so I can 
make sure they're in the same zone.

Can we modify the ec2-start-instance to provide a way to specify a zone?