Comment 6 for bug 1390044

Reviewed: https://review.openstack.org/133061
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=4009440abce43c25ab0b0e93c4b2386ef1965a98
Submitter: Jenkins
Branch: master

commit 4009440abce43c25ab0b0e93c4b2386ef1965a98
Author: Alexei Sheplyakov <email address hidden>
Date: Thu Nov 6 13:33:18 2014 +0300

    ubuntu: simplify the kernel updates

    At the moment the kernel version to be installed on Ubuntu nodes is hard
    coded in config.mk (and several other files, such as requirements-deb.txt).
    This version must coninside with the version of the kernel used by Debian
    installer (otherwise Debian installer won't be able to load any kernel
    modules which in general breaks the provisioning). As a result updating
    the kernel (say, to incorporate the upstream security fixes) requires
    a lot of manual intervention: downloading the netboot image, finding out
    the exact kernel version it uses, updating config.mk, requirements-deb.txt,
    and so on.

    This patch makes the process much simpler: updating the kernel (to a version
    provided by Ubuntu) boils down to changing the UBUNTU_KERNEL_FLAVOR
    variable (and possilby the UBUNTU_NETBOOT_FLAVOR variable).

     * config.mk: introduce UBUNTU_KERNEL_FLAVOR and UBUNTU_NETBOOT_FLAVOR
       variables. The former specifies which kernel should be installed on
       nodes, and the latter tells which netboot variant should be used.

     * image/ubuntu/module.mk: install the kernel specified by
       the UBUNTU_KERNEL_FLAVOR variable. There's no need to use exactly
       the same version of the kernel as Debian installer does, as image
       based provisioning does not use Debian installer at all.

     * mirror/ubuntu/boot.mk: guess and write the installer kernel version
       into a file which can be include'd by other modules. While at it
       reduce the copy-paste noise.

     * mkrepo.sh: make sure that the kernel (and the correspodning headers)
       (meta-)packages specified by UBUNTU_KERNEL_FLAVOR are included into
       the mirror.

    Change-Id: Ia8db615284644b0e2bcdb70c1c7bb1f4388d5e46
    Related-bug: #1390044
    Related-bug: #1383641