[lib] Handle upgrade from SUNWzebra to Quagga for 'interface fooX:Y' commands

[lib] Handle upgrade from SUNWzebra to Quagga for 'interface fooX:Y' commands

2006-10-14 Paul Jakma <paul.jakma@sun.com>

	* if.c: (general) Handle upgrades from SUNWzebra, which tried
	  to track each logical interface as a seperate struct
	  interface, to Quagga, which assigns only one struct interface
	  per ifindex.
	  (if_sunwzebra_get) Try decompose a logical interface name
          (fooX:Y) to the 'primary' name (fooX), for Solaris.
          (interface_cmd) Use if_sunwzebra_get on Solaris.