dhclient: Ignore vendor-identifying DHCP options defined in RFC 3925
    
    Ignore DHCP options 124 and 125 to shut up the warning messages.
    These options are defined in the RFC 3925.
    
    PR:		281361
    Reviewed by:	jrm (mentor), otis (mentor), thj
    Tested by:	jlduran@gmail.com
    MFC after:	2 weeks
    Differential Revision:	https://reviews.freebsd.org/D46760
    
    (cherry picked from commit 38c63b52830c85013f30bc62b2b32f3936d84e65)