net-lib: check if addr exists before checking for dad state
    
    Before we check if dad is done we should first make sure,
    that there is a link local address where we do the check.
    
    Due to this issue, on ipv6 only setups sometimes dhclient started
    asking for ip address, before the link local address was present
    and failed immediately.
    
    (cherry picked from commit daa49cc2216d6387541ef36e8427081f6b02f224)
    
    Resolves: #1765014
    
    patch_name: 0058.patch
    present_in_specfile: true
    location_in_specfile: 58
    squash_commits: true