nl_addr_parse handling of 'default', 'any', and 'all'

[Justin Mayfield]

Hi,

I found a small bug in the nl_addr_parse function when being passed the 
strings "default", "any", or "all".  Currently nl_addr_parse will create 
a zeroed nl_addr with a length corresponding to the family/hint or 
AF_INET if omitted.  This behavior when used in conjunction with the 
libnl-route library to add default routes to the system has the side 
effect of creating a route to the host address 0.0.0.0/32.

Attached is a patch that matches the iproute2 behavior more closely 
where we do set the family but the length of the nl_addr is set to 0.

Cheers,
Justin Mayfield
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