[Bug 1490796] [NEW] cloud-init must check/format Azure empheral disks each boot

[Stephen A. Zarkos]

Public bug reported:

Ubuntu 14.04.3 (20150805) on Azure with cloud-init package
0.7.5-0ubuntu1.8.

On Azure cloud-init prepares the ephemeral device as ext4 for the first
boot.  However, if the VM is ever moved to another Host for any reason,
then a new ephemeral disk might be provided to the VM.  This ephemeral
disk is NTFS formatted, so for subsequent reboots cloud-init must detect
and reformat the new disk as ext4.  However, with cloud-init
0.7.5-0ubuntu1.8 subsequent boots may result in fuse mounted NTFS file
system.

This issue occurred in earlier versions of cloud-init, but was fixed
with bug 1292648 (https://bugs.launchpad.net/ubuntu/+source/cloud-
init/+bug/1292648).  So this appears to be a regression.

Repro:
  - Create an Ubuntu 14.04.3 VM on Azure
  - Resize the VM to a larger size (this typically moves the VM)
  - Log in and run 'blkid' to show an ntfs formatted ephemeral disk:

    # blkid
    /dev/sdb1: LABEL="Temporary Storage" UUID="A43C43DD3C43A95E" TYPE="ntfs"


Expected results:
  - After resizing the ephemeral disk should be formatted as ext4.

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

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Title:
  cloud-init must check/format Azure empheral disks each boot

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