Refer to kernel of FreeBSD "kFreeBSD" to avoid confusion between
the Operating System (FreeBSD) and its kernel (kernel of FreeBSD).
* loader/i386/bsd.c (grub_freebsd_boot): Read kernel environment
from "kFreeBSD" namespace (rather than "FreeBSD"). Update all
users.
(GRUB_MOD_INIT (bsd)): Rename "freebsd" command to "kfreebsd",
"openbsd" to "kopenbsd", "netbsd" to "knetbsd", "freebsd_loadenv"
to "kfreebsd_loadenv", "freebsd_module" to "kfreebsd_module",
and "freebsd_module_elf" to "kfreebsd_module_elf". Update all
users.
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