Add the ability to ensure supported kernel

Ubuntu has [deprecated](https://wiki.ubuntu.com/1204_HWE_EOL) all
hardware enablement (HWE) kernels which are basically the kernels for
newer releases backported to this release. They are named with suffixes
of _lts-quantal_, _lts-raring_, _lts_saucy_ and those kernels are only
supported until 14.04.1 is released (Aug 8, 2014)

As we are using the original kernel series supplied with 12.04 and that
is still supported until April 2017, we don't need to do anything, and
this PR is actually a NOOP. However this PR ensures that if
hwe-support-status changes in future, our kernel will be updated and
serves as a model for other environments where we _do_ need to make this
change.

```
ssharpe@ci-master-1:~$ hwe-support-status --verbose
You are not running a system with a Hardware Enablement Stack. Your
system is supported until April 2017.
```

If we did upgrade to _lts-trusty_ packages, then we would still be
supported until April 2017 (as that is the EOS for Ubuntu 12.04 Precise)