[Bug 1514485] Re: cloud-init should use "nofail" instead of "bootwait"

[Ben Howard]

Marking as "critical" owing to Azure instance death. Because Azure
instances consider ephemeral devices to be ephemeral per-boot, a stop,
resized, or fabric restarted instance may not come back if the instance
is presented with a new ephemeral device.

Linked branch has been tested.

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

** Summary changed:

- cloud-init should use "nofail" instead of "bootwait"
+ [SRU] cloud-init should use "nofail" instead of "bootwait"

** Description changed:

- Snapshotted instances may fail to boot due to a change in udev in 15.10.
- Starting with Ubuntu 15.10, "nobootwait" != "nofail".
+ SRU JUSTIFICATION
+ 
+ [IMPACT] Prior to Ubuntu 15.10, the mount option of "nobootwait" ==
+ "nofail." However, with Ubuntu 15.10, this is no longer the case. As a
+ result, snapshotted, stopped and restarted, or migrated Cloud instances
+ may fail to boot if the ephemeral device does not match /etc/fstab.
+ 
+ [FIX] Changed the default mount option to "nofail"
+ 
+ [TEST]
+ 1. Boot Ubuntu 15.10 on Azure
+ 2. Upgrade cloud-init to proposed version
+ 3. Confirm that "nobootwait" for the ephemeral device has been changed to "nofail"
+ 4. Shutdown instance
+ 5. Restart instance, confirm it comes up
+ 6. Capture restarted instance
+ 7. Boot captured image
+ 8. Confirm that capture instance came back up
+ 
+ [ORIGINAL REPORT]
+ Snapshotted instances may fail to boot due to a change in udev in 15.10. Starting with Ubuntu 15.10, "nobootwait" != "nofail".
  
  For reference, Ubuntu's systemd had a patch that accepted nobootwait
  [1], but that was dropped in 15.10.  discussed some in ubuntu-devel at
  [2]
  
  --
  [1] https://anonscm.debian.org/cgit/pkg-systemd/systemd.git/commit/?h=ubuntu&id=8fbf6c7e671c663190eae8a63b158e686c3d41fa
  [2] http://irclogs.ubuntu.com/2015/11/09/%23ubuntu-devel.html#t13:34

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https://bugs.launchpad.net/bugs/1514485

Title:
  [SRU] cloud-init should use "nofail" instead of "bootwait"

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