Set ethernet address validate function

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Validate ethernet address

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Remove unnecessary info message

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Refactor variable names

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Use random mac address as default

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>