bug#26339: [PATCH v3 7/9] scripts: system: Adapt "init" to new bootloader API.

[Mathieu Othacehe]

> "bootloader-installer.drv" instead of "installer"?

I think that bootloader-installer is fine as per reconfigure.
>
>>[reinstall-bootloader]
>> -       (install-proc
>> +       (installer
>>          (let ((procedure (bootloader-configuration-installer
>>                            (operating-system-bootloader os)))
>>                (target    (or target "/")))
>
> "installer.drv" instead of "installer", and "installer" instead of 
> "procedure".  Also, deja vu.  Patch 6/9 also includes something of this part.

Ok for install-proc -> bootloader-install and procedure -> installer as
per reconfigure.
>
> Otherwise LGTM!