docs: Add news article for volume encryption modifications
    
    Include both the domain and storage modifications in a "Removed
    features" section as well as describing the improvement to allow
    using a raw input volume to create the luks encrypted volume.
    
    Signed-off-by: John Ferlan <jferlan@redhat.com>
    ACKed-by: Michal Privoznik <mprivozn@redhat.com>