This is a fix of commit 3f769dc (setup-apkrepos: exclude faulty mirrors
from detection)

ref #4017

Non-breaking space (0xc2 0xa0) was added by mistake. Replace it with a
normal space.

Give the option so enable lvm when asking how o use selected disk

When we specify the hostname as an arg we run the tool non-interactively
and we only set it if the specified hostname is valid.

openrc will set HOSTNAME to "(none)" which makes setup-hostname script
go nuts.