[arch-general] Bridge interface with netctl

[arnaud gaboury]

>
> Now, I want to start the bridge:
> # netctl start bridge-hortensia
> % ping -c 3 8.8.8.8
> connect: Network is unreachable
>
To be more precise, here is the output of ip addr when starting the
bridge profile. As you can see, there is no more IP adress assigned on
enp7s0 neither on br0

 % ip addr
2: enp7s0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc
pfifo_fast master br0 state UP group default qlen 1000
    link/ether 14:da:e9:b5:7a:88 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::16da:e9ff:feb5:7a88/64 scope link
       valid_lft forever preferred_lft forever
7: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state
UP group default
    link/ether 14:da:e9:b5:7a:88 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::31:82ff:fe4f:3e08/64 scope link
       valid_lft forever preferred_lft forever