PATCH: Some random ethtool fixes

The patch I sent out earlier had some other changes which were just 
little bug fixes, and I have distilled those into this patch.  This 
patch applies on ethtool.c (from the application).  It fixes these 
problems:

* Allows ethtool -s to set the negotiated speed to 1000 (full/half)
* Causes ethtool -s ethN autoneg on to enable gigabit speeds as well as 
the others
* Fixes a spelling error where external was spelled "externel"