On my X1 Carbon Gen 3 with my network dongle, systemd-networkd is failing to notice the connection is UP and get an IP address

http://s.natalian.org/2015-04-27/1430107323_1912x1036.png

My workaround is to now use `dhclient`.

I say this is a regression as I'm confident it used to work before <218. I'm using 219-6 on Archlinux.

00:19.0 Ethernet controller: Intel Corporation Ethernet Connection (3) I218-LM (rev 03)
        Subsystem: Lenovo Device 2227
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 43
        Region 0: Memory at f1100000 (32-bit, non-prefetchable) [size=128K]
        Region 1: Memory at f113e000 (32-bit, non-prefetchable) [size=4K]
        Region 2: I/O ports at 3080 [size=32]
        Capabilities: <access denied>
        Kernel driver in use: e1000e
        Kernel modules: e1000e