Simplify usage of OSSnapshot constuctor
Simplify usage of OSSnapshot constuctor

Change-Id: If6a6fe9d53e59e1450c2ef24fd4ce286291775c7

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