After a successful connection to a service, ConnMan starts DHCP
procedure to get an IPv4. However, if such procedure fails then
ConnMan will assign a Link-local address to that given interface. At
the end of this process, ConnMan will notify the assigned IPv4 address
with "dhcp" as method. We consider it should be "auto" in order to
know that the DHCP process failed and that address is a Link-local
address. What do people think?