Remove obsolete comment
Remove obsolete comment

This comment was copied at initial stage of a porting of validation from
Nova. Now it's obsolete.

Change-Id: Ie9343d80059b98477148b232509c33689423ee41

hayderimran7/ec2-api,openstack/ec2-api,stackforge/ec2-api,hayderimran7/ec2-api,openstack/ec2-api,stackforge/ec2-api