[Bug 724601] [NEW] UEC images should disable udev persistent net rules

[Alex Bligh]

Public bug reported:

Binary package hint: cloud-init

Persistent interface naming should be disabled in UEC images, as it
causes more harm that good.

Firstly, cloud systems generally expect the interfaces to be created in
the order they are created in the hypervisor. Renaming them
(particularly when some images are persistent, and some are not) is
confusing.

Secondly, it causes inconsistency, in that the Xen pv interfaces (for
instance) are ignored, whereas the kvm ones aren't.

Thirdly, it causes terrible problems (read unbootable machines) on old
Xen (and perhaps newer Xen), where the same interface appears twice -
once as an emulated HVM interface, and one as a PV on HVM interface each
with the same MAC address. That makes for confusion, particularly given
one subsystem is ignored and one isn't. Essentially the interfaces
constantly rename.

The (very easy) solution is to disable persistent net interface
renaming.

** Affects: cloud-init (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/724601

Title:
  UEC images should disable udev persistent net rules