grubby-bls: only attempt to update the cmdline if was already set

Fix installed man page file mode bits

grubby-bls: strip only /boot from paths
Make grubby to also update GRUB_CMDLINE_LINUX in /etc/default/grub
grubby-bls: fix corner case when a kernel param value contains a '='
grubby-bls: update man page to match options in current wrapper script
grubby-bls: always escape the delimiter character used in sed commands
grubby-bls: add a --no-etc-grub-update option

grubby-bls: don't print rpm-sort error messages
grubby-bls: remove -o option and support -c for ppc64le grub config
grubby-bls: fix logic to check if the kernelopts var is defined in a BLS
grubby-bls: don't update grubenv when generating grub.cfg for ppc64le

grubby-bls: unset default entry if is the one being removed
grubby-bls: error if args or remove-args is used without update-kernel
grubby-bls: make --update-kernel ALL to update kernelopts var in grubenv
grubby-bls: fix --add-kernel not working when using the --args option

grubby-bls: show absolute path when printing error about incorrect param

Use mountpoint command to check whether /boot is a mount point

grubby-bls: expand all variables in options field when updating it

Correctly set LDFLAGS to include hardened flags (pjones)

grubby-bls: lookup default entry by either id or title on grub2

grubby-bls: allow to specify the same kernel param multiple times
grubby-bls: expand kernel options if these are environment variables
grubby-bls: always generate the BLS snippets when adding new entries
Improve man page for --info option (jstodola)

grubby-bls: also print the absolute path in the --default-kernel option

grubby-bls: print the absolute kernel and initramfs images paths
grubby-bls: make info print the root parameter if is present in cmdline

grubby-bls: use title field instead of version for zipl default entry

installkernel-bls: remove unnecessary check for GRUB_ENABLE_BLSCFG=true

grubby-bls: only compare using relative paths if /boot is a mount point