Allow generating initramfs images on the /boot directory
    
    The dracut kernel-install scripts should be useful also for setups that
    are not following the BootLoaderSpec. So if the destination directory
    for the BLS kernel and initramfs doesn't exist, fallback to install the
    initramfs images in /boot.
    
    Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>