Public bug reported:

During proposed SRU testing, I discovered an upgrade issue for EC2
customers who don't reboot their instances after cloud-init upgrade and
instead issue the commandline 'systemctl restart cloud-init'.

The following traceback is caused by the new instance document changes added in 

What this changeset didn't account for is our pickled ec2localdatasource
from earlier get_data runs, not persisting an Ec2LocalDatasouce.identity
attribute so subsequent get_instance_id calls wouldn't see this
attribute on the class yet.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: cloud-init 17.2-30-gf7deaf15-0ubuntu1~16.04.1
ProcVersionSignature: Ubuntu 4.4.0-1050.59-aws 4.4.98
Uname: Linux 4.4.0-1050-aws x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CloudName: Amazon - Ec2
Date: Thu Feb  8 23:42:52 2018
Ec2AMI: ami-c9a693ac
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-2b
Ec2InstanceType: t2.micro
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
PackageArchitecture: all
 PATH=(custom, no user)
SourcePackage: cloud-init
UpgradeStatus: No upgrade log present (probably fresh install)
 2018-02-08 23:35:05,664 -[DEBUG]: strict_mode: warn, 
 2018-02-08 23:39:12,559 -[WARNING]: failed stage init
 AttributeError: 'DataSourceEc2Local' object has no attribute 'identity'
 2018-02-08 23:42:09,995 -[WARNING]: failed stage init
 AttributeError: 'DataSourceEc2Local' object has no attribute 'identity'

** Affects: cloud-init (Ubuntu)
     Importance: High
     Assignee: Chad Smith (chad.smith)
         Status: In Progress

** Tags: amd64 apport-bug ec2-images package-from-proposed third-party-packages 

** Changed in: cloud-init (Ubuntu)
       Status: Triaged => In Progress

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  ec2: systemctl restart cloud-init after upgrade 17.1.46 -> 17.2.30

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