Another batch of grubby-bls fixes
    
    - installkernel-bls: remove unnecessary check for GRUB_ENABLE_BLSCFG=true
      Resolves: rhbz#1647721
    - grubby-bls: use title field instead of version for zipl default entry
      Related: rhbz#1645200
    - grubby-bls: print the absolute kernel and initramfs images paths
      Resolves: rhbz#1649778
    - grubby-bls: make info print the root parameter if is present in cmdline
      Resolves: rhbz#1649791
    
    Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>