Do it by manually extracting packages from pungi cache instead of
redownloading, because we can't access yum configuration (repositories,
gpg keys etc) here, so it would be even more hacky...
All this is needed because pungi does not support including multiple
versions of a single package.
Anaconda/pungi doesn't support multiple versions of the same package at
the time, so place all kernels on installation media in separate
directory and install them in %post script.
Unfortunately single "install" command installs only one version of
package, even if multiple matches, so must list all versions explicitly.
Include all major releases from 3.2 to 3.11 to not require change it too
often.
Also exclude kernel from fedora repos to force use of qubes kernel.
