[SRU] sync 14.04 cloud-initramfs-tools to 12.04

=== Begin SRU Template ===
[Impact]
MAAS uses 'maas images' from http://maas.ubuntu.com/images/ephemeral-v2/ to
boot a ephemeral environment for curtin to do an install in. The ephemeral
environment is pxe booted with root on a iscsi target also provided by MAAS

For hardware enablement kernels the kernel is not installed in the iscsi
root. Instead, the initramfs contains all the modules that are necessary
and cloud-initramfs-copymods takes care of copying those modules from
/lib/modules in the initramfs into the target.

This is a well tested path in 14.04 and later, but was not present in 12.04.

The request is to bring cloud-intiramfs-tools code from 14.04 to 12.04. This would also bring in overlayroot and dyn-netconf packages.

[Test Case]
Simple test case: install cloud-initramfs-copymods in prese.
  * boot precise system
  * enable proposed
  * apt-get update && apt-get install -qy cloud-initramfs-copymods
  * initrd=/boot/initrd.img-$(uname -r)
    echo $initrd
    lsinitramfs $initrd | grep copymods && echo GOOD || echo MISSING

MAAS Image Test case: Check maas image for presense of copymods
  * download latest daily initramfs precise hwe-t. from http://maas.ubuntu.com/images/ephemeral-v2/daily/precise/amd64/ . Under that URL you'll find a date. Given that date:
     $ serial=20151105
     $ burl=http://maas.ubuntu.com/images/ephemeral-v2/daily/precise/amd64
     $ wget "$burl/$serial/trusty/generic/boot-initrd" -O boot-initrd
     $ lsinitramfs | grep copymods && echo GOOD || echo MISSING

MAAS 1.9 Test Case: Deploy MAAS 1.9 with bcache.
  * configure a node for bcache
  * install node
  * currently this will fail with error like:
     FATAL: Could not load /lib/modules/3.13.0-68-generic/modules.dep: No such file or directory
     An error occured handling 'bcache0': ProcessExecutionError - Unexpected error while running command.
     Command: ['modprobe', 'bcache']

[Regression Potential]
New binary only package will not likely cause any regression. Only to people who pick up this new package which takes action on their part.

There are 2 changes that come in to existing code, both are in growroot.
a.) identify partitions named with a 'p' (mmcblk0p1) (LP: #1236380)
b.) support new versions of growpart which changed exit status. This change is backwards compatible as growpart looks at the exit output written rather than only at the exit code.

[Other Information]
MAAS precise images build with ppa:maas-maintainers/maas-ephemeral-images [1] enabled. That ppa currently has a quantal level version of cloud-initramfs-tools in it. Taking the trusty version of cloud-initramfs-tools back will allow us to drop that package in the PPA and also have a more supportable path.

  [1] https://launchpad.net/~maas-maintainers/+archive/ubuntu/maas-ephemeral-images/
=== End SRU Template ===

cloud-initramfs-copymods is an initramfs module that copies moves the modules from the initramfs into the root if there are no modules in the root. This allows you to boot an initramfs with a root= and after pivot_root still see the modules as if they were there.

bug 1513176 reported failure of bcache with maas images. The failure was two pronged.
A.) there was no bcache module in the initramfs .
B.) in precise, there is no cloud-initramfs-copymods available in the archive

In order to boot hwe kernels with 12.04 in MAAS, we need to add cloud-initramfs-copymods to the initramfs.