[nwam-dev] code review for 11926

[Anurag S. Maskey]

code review request:

        11926 Legacy location with NIS hostnames fails
        http://defect.opensolaris.org/bz/show_bug.cgi?id=11926

        
http://zhadum.east/export/ws/am223141/checkout-area/nwam1-fixes/webrev/

fix involves validating values in ypservers are ip addresses.  If not, 
then the address is searched for in /etc/inet/hosts.

Thanks,
Anurag