Description of problem:
After migration, retrieve app info with rhc app-show, found that the app's uuid is different from its gear's uuid displayed in ssh connection url, eg:
jenkins1 @ http://jenkins1-migration1.dev.rhcloud.com/ (uuid: 522d31f74f96a84b15000006)
---------------------------------------------------------------------------------------
  Domain:  migration1
  Created: 10:27 AM
  Gears:   1 (defaults to small)
  Git URL: ssh://5049404018f711e396e622000aee8a99.rhcloud.com/~/git/jenkins1.git/
  SSH:     5049404018f711e396e622000aee8a99.rhcloud.com

  jenkins-1 (Jenkins Server)
  --------------------------
    Gears: 1 small

app uuid is 522d31f74f96a84b15000006
SSH connection url shows the gear's uuid is 5049404018f711e396e622000aee8a99
The two uuids are different

Version-Release number of selected component (if applicable):
After migration on devenv_3758

How reproducible:
Always

Steps to Reproduce:
1. Create application on devenv-stage_465
2. Upgrade to latest(devenv_3758) and migrate
/usr/bin/rhc-admin-migrate-datastore --non-compatible --version 2.0.32
oo-admin-upgrade upgrade-node --version 2.0.33 --ignore-cartridge-version
3. Clear broker cache
4. Query an application from mongo
db.applications.findOne({"name":"jenkins1"})


Actual results:
After step 4: the _id is different from uuid in group_instances, and the uuid(5049404018f711e396e622000aee8a99) doesn't make any sense for it's not being used. I've tried to reproduce on a fresh devenv_3758 instance, the _id and uuid fields have the same value. I'm opening this bug since I found this issue only after migration. Not knowing it will cause any problems yet.
<snip>
"group_instances" : [
		{
			"_id" : ObjectId("522d31f74f96a84b15000011"),
			"gears" : [
				{
					"_id" : ObjectId("522d31f74f96a84b15000006"),
					"app_dns" : true,
					"host_singletons" : true,
					"name" : "jenkins1",
					"quarantined" : false,
					"server_identity" : "ip-10-238-138-153",
					"sparse_carts" : [ ],
					"uid" : null,
					"uuid" : "5049404018f711e396e622000aee8a99"
				}
			]
		}
	],

</snip>

Expected results:
_id and uuid should be the same.

Additional info: