A bunch of fixes for BLS
    
    - add 10_linux_bls grub.d snippet to generate menu entries from BLS files
      Resolves: rhbz#1636013
    - Only set kernelopts in grubenv if it wasn't set before
      Resolves: rhbz#1636466
    - kernel-install: Remove existing initramfs if it's older than the kernel (pjones)
      Resolves: rhbz#1638405
    - Update the saved entry correctly after a kernel install (pjones)
      Resolves: rhbz#1638117
    - blscfg: sort everything with rpm *package* comparison (pjones)
      Related: rhbz#1638103
    - blscfg: Make 10_linux_bls sort the same way as well
      Related: rhbz#1638103
    - don't set saved_entry on grub2-mkconfig
      Resolves: rhbz#1636466
    - Fix menu entry selection based on ID and title (pjones)
      Resolves: rhbz#1640979
    
    Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>