Read mac address from file

Format for file is xx:xx:xx:xx:xx:xx
Merge pull request #15 from Coi-l/macaddr

Read mac address from file
Implement disconnect functionality

To disconnect driver must tell hardware delete_sta,
delete_bss and then set link to idle.

Signed-off-by: Eugene Krasnikov <k.eugene.e@gmail.com>
Simplistict scan delay

mac80211 won't think that the scan has started until .hw_scan returns
with a 0. We can't complete the scan before it has started. Make a
simplistic scan delay.