utils: implement BIOS boot for windows

Create ogboot.me and ogboot.secondboot as empty files and
ogboot.firstboot with the value "iniciado" in the root of
the BIOS Windows system partition.
The files must contain data for GRUB to be able to write content,
therefore these are created containing 3072 null bytes.
The Windows boot process is handled by the "pxe" profile.
There the files ogboot.me, ogboot.firstboot and ogboot.secondboot
are used as a state machine to chose between booting Windows and
ogLive.
The first Windows boot happens if ogboot.me and ogboot.firstboot
are identical, then "iniciado" is written in ogboot.firstboot.
We skip this stage as we create ogboot.firstboot with 'iniciado'.
The second Windows boot occurs if ogboot.me and ogboot.secondboot
are boot identical, then "iniciado" is written in ogboot.secondboot.
After the Windows boot ogLive is booted.

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