set nativenet address to host pid on config_load
call config_load in auto_init
set id as well

also add include
addresses https://github.com/RIOT-OS/RIOT/pull/700#issuecomment-35162692
move config_load from auto_init to kernel_init

addresses https://github.com/RIOT-OS/RIOT/pull/700#issuecomment-35742513