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[Duncan McGreggor <duncan@xxxxxxxxxxxxx>]

Merged 415486-reservation-object [r=therve,lifeless,jkakar] [f=415486]

This change adds a missing object representation for AWS reservations parsed
from Amazon EC2 API call "describeInstances". Instead of mimicking the data
structure of the response XML, a developer-friendly optimization was 
implemented where the reservation is available on the instance, and it is the 
instances which are returned. 

** Changed in: txaws
       Status: In Progress => Fix Committed

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Missing reservation representation
https://bugs.launchpad.net/bugs/415486
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Status in txAWS: Twisted Amazon: Fix Committed

Bug description:
Currently, txaws.ec2.client.EC2Client.describe_instances doesn't return an accurate representation of an XML instance response from Amazon. In particular, descibe_instances' callback (_parse_reservation) only returns the instance information (from the "instanceSet" XML tag). Instead of a list of instance objects, _parse_reservation should probably return a list of reservation objects.

In order to do this, a Reservation object needs to be created. This object should have the following attributes:
 * reservation_id
 * owner_id
 * groups
 * instances