commands/cmp: Only return success when both files have the same contents

commands/cmp: Only return success when both files have the same contents

This allows the cmp command to be used in GRUB scripts to conditionally
run commands based on whether two files are the same.

The command is now quiet by default and the -v switch can be given to enable
verbose mode, the previous behavior.

Update documentation accordingly.

Suggested-by: Li Gen <ligenlive@gmail.com>
Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>