Instead of exiting as a file inside wmii_path cannot be opened, we wait
until wmii_path is found again (particularly the /rbar part, that is),
re-setup our files and continue as if nothing happened.
This will make wmiistatus survive restarts of wmii and make it wait for
/mnt/wmii to appear when booting up (and wmiistatus gets started before
wmii itself)
The network interface must be supported by ethtool, as its syscall is
used for this. This is at least the case for e1000 cards.
Unfortunately, getting the speed needs root privileges. Therefore, you
have to enable it in configuration separately.
