[Bug 1300941] [NEW] user-data on OpenNebula restricted to shell sourceable content

[Scott Moser]

Public bug reported:

OpenNebula uses a text file with shell variables for storing the
configuration variables (including user provided data). Some user data
may not be renderable into this format, so using base64 encoding
alleviates the problem. This change considers that, by default, USERDATA
variable contains a base64 encoded string with the user provided data.
This behavior can be deactivated by defining the USERDATA_ENCODING
variable to anything different to "base64" (similarly to the Azure data
source).

This feature is of special interest for resource providers with rOCCI-
server front-end as the ones in EGI's Federated Cloud
(https://wiki.egi.eu/wiki/Fedcloud-tf:Main)

** Affects: cloud-init
     Importance: Medium
         Status: Fix Released

** Affects: cloud-init (Ubuntu)
     Importance: Medium
         Status: In Progress

** Branch linked: lp:~enolfc/cloud-init/opennebula-b64-userdata

** Also affects: cloud-init
   Importance: Undecided
       Status: New

** Changed in: cloud-init
       Status: New => Fix Committed

** Changed in: cloud-init
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1300941

Title:
  user-data on OpenNebula restricted to shell sourceable content

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