Add more stuff to KDE image, build it for more releases
    
    This is related to enabling update tests for KDE. While testing
    that it transpired that the KDE disk image is missing various
    stuff that is on the live image and systems installed from the
    live image; this is because the kde-desktop-environment env
    group doesn't by default include several groups and individual
    packages that the live kickstart *does* include. So our current
    disk image closely matches what you get if you do a network
    install and pick the KDE env group and don't pick any option
    groups, but that's not a very common thing to do, and it causes
    problems for the tests (e.g. okular and firefox not being
    there). I think it's reasonable to make the image resemble a
    live install more closely; this is more convenient but I think
    it's *also* more useful, as there are probably far more KDE
    installs out there *with* these things than without them. More
    KDE installs are probably done with the live than via network
    install, and even KDE installs done via netinst may well have
    these bits added subsequently.
    
    Obviously, we bump the image version with this change, so we'll
    need to update the scheduler and templates also.
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>