Description of problem:
ksdevice=bootif does not work in virsh install

Version-Release number of selected component (if applicable):
anaconda 13.21.117

How reproducible:
100%

Steps to Reproduce:
1. install virtual machine with multiple bridged network interfaces. Specify ksdevice=bootif as kernel parameter. 

virt-install -n rhel --vnc --vcpus=2 -r 2048  \
-f /var/lib/libvirt/images/rhel.img -s 10 \
--network bridge:br-rhts --network bridge:br-igb --network bridge:br-netxen --network bridge:br-ixgbe \
--os-type=linux --os-variant=virtio26  --accelerate \
--location http://download.englab.brq.redhat.com/pub/rhel/released/RHEL-6/6.1/Server/x86_64/os/ --noautoconsole  \
-x "ksdevice=bootif ks=http://download.englab.brq.redhat.com/perf-results/ks.cfg text console=tty0 utf8 console=ttyS0,115200"; 

2. virsh console rhel

  
Actual results:
Even if ksdevice=bootif were passed as parameter installation still prompts me to select installation device:

┌───────────────┤ Networking Device ├───────────────┐
│                                                   │
│ You have multiple network devices on this system. │
│ Which would you like to install through?          │
│                                                   │
│  eth0 - Ethernet device eth0 - 52:54:00:d2:c5:68  │
│  eth1 - Ethernet device eth1 - 52:54:00:1b:89:b7  │
│  eth2 - Ethernet device eth2 - 52:54:00:bd:e8:b9  │
│  eth3 - Ethernet device eth3 - 52:54:00:98:fc:cf  │
│                                                   │
│    ┌────┐        ┌──────────┐        ┌──────┐     │
│    │ OK │        │ Identify │        │ Back │     │
│    └────┘        └──────────┘        └──────┘     │
│                                                   │
│                                                   │
└───────────────────────────────────────────────────┘


Expected results:
Correct installation from boot interface without prompting