bsdinstall: bootconfig: Try to clean old efi boot entries

[manu]

Summary

If one install FreeBSD on the same machine multiple times in a row or
on different harddrive they have a lot of 'FreeBSD' efi boot entries added.
With this patch we now do :

• If there is no 'FreeBSD' entry we add one like before
• If there is one or more entries we ask the user if they want to delete them all and add a new one
  • If they say yes we do that
  • If they say no we prompt them an inputbox so they can enter a different entry name if they want, it defaults to 'FreeBSD'

MFC after: 2 weeks
Sponsored by: Beckhoff Automation GmbH & Co. KG

[bapt]

usr.sbin/bsdinstall/scripts/bootconfig

68

efibootmgr | grep -c 'FreeBSD$'

76

$DIALOG ?

[manu]

Address bapt's comments.

[manu]

@imp are you ok with this ?

[imp]

This ticks all my boxes. It's optional, it prompts the user, and it appears to do the right sort of things to manage the list.