p/fuel: bm: linux-image-generic-hwe-16.04-edge

p/fuel: bm: linux-image-generic-hwe-16.04-edge

The Salt way to pin the kernel version is via its reclass model, by
defining system.kernel.version. However, this only works with
explicit kernel package names and not with meta package names
(e.g. linux-image-4.13.0-9916-generic is expected instead of
      linux-image-generic-hwe-16.04-edge, which would break the
`linux_kernel_old_absent` state).

For now, let's explicitly call `pkg.install` for the kernel and
headers packages, using the meta package name to ensure automatic
fallback to Ubuntu packages if Armband repos are missing,
respectively to automatically pick up new kernel package names
in case of meta + kernel packages bump later.

JIRA: ARMBAND-280

Change-Id: I5448df1de1b3c211583708402b5c7497df92fc16
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>