Some vendors store the mac addresses of arge(4) as a literal sring in the

Some vendors store the mac addresses of arge(4) as a literal sring in the
form xx:xx:xx:xx:xx:xx complete with ":" characters taking of 18 bytes
instead of 6 integers.  Expose a "readascii" tuneable to handle this case.

Remove restriction on eepromac assignement for the first dev instance only.

Add eepromac address for DIR-825 to hints file.

Add readascii hint for DIR-825

Reviewed by:	adrian@