Public bug reported:

[SRU justification]
Without this fix, images built with cloud-init 0.7.8-1-g3705bb5-0ubuntu1  and 
later will not correctly boot and become unreachable
[Impact]
Some cloud images built with this version of cloud-init may become unusable

[Fix]
Reinstate the second element of the datasources list as a tuple instead of a 
string.

[Test Case]
This test must be done on CloudSigma to complete correctly :

Build cloud image with only the CloudSigma datasource using cloud-init version 
0.7.8-1-g3705bb5-0ubuntu1 or later
Launch an instance with this image
The instance will boot but will not be accessible through ssh

With this fix,the instance will complete its boot sequence and be
accessible through ssh

[Regression]
None expected, the second element was a tuple in previous versions of the 
CloudSigma datasource

[Description of the problem]
The issue materialized itself on cloud instances launched with such images that 
became unreachable through SSH with the following message:

"Connection closed by {IP} port 22"

** Affects: cloud-init (Ubuntu)
     Importance: High
     Assignee: Scott Moser (smoser)
         Status: In Progress

** Affects: cloud-init (Ubuntu Xenial)
     Importance: High
         Status: Confirmed

** Affects: cloud-init (Ubuntu Yakkety)
     Importance: High
         Status: Confirmed

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

** Changed in: cloud-init (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1648380

Title:
  cloud-init fails to find CloudSigma datasource with cloud-init
  0.7.8-1-g3705bb5-0ubuntu1

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