Icera based ZTE modems should use DHCP configuration

[Alexander Orlov <alxorlov2 gmail com>]

Hello, everybody!

ModemManager uses MM_MODEM_IP_METHOD_STATIC property for all ZTE
Icera-based devices. But it should use DHCP for some of them:
- MF192+, which I have;
- MF192 (http://www.draisberghof.de/usb_modeswitch/bb/viewtopic.php?t=889);
- MF591 (http://www.draisberghof.de/usb_modeswitch/bb/viewtopic.php?t=932);
And may be more. All these devices works after invoking "sudo dhclient
usb0" after connection with NetworkManager.

May be there should be implemented some udev property to handle this
(much like it is done for ID_MM_ZTE_PORT_TYPE_AUX)? Or there should be
another solution. Anyway, I could help you with this.

-- 
Alexander Orlov