Description of problem:
PCI devices resource's sVirt label is different as set in virt-manager Security page.

Version-Release number of selected component (if applicable):
libvirt-0.8.7-13.el6.x86_64
qemu-img-0.12.1.2-2.150.el6.x86_64
qemu-kvm-0.12.1.2-2.150.el6.x86_64
virt-manager-0.8.6-3.el6.noarch
kernel-2.6.32-122.el6.x86_64
selinux-policy-targeted-3.7.19-78.el6.noarch

How reproducible:
5/5

Steps to Reproduce:
1.Prepare an VM which is not running .
#setenforce 1

2.Issue "virt-manager" to open virt-manager UI.

3.Select the existing VM, then "open" -> "details" -> "Overview" -> "Security"

4.Select "static" option, then specify a label,and apply it.

such as: "system_u:system_r:svirt_t:s0:c100,c200"

5.Change context of guest image file, such as:

# chcon system_u:object_r:svirt_image_t:s0:c100,c200 /var/lib/libvirt/images/nfs_test.img

6.Check the NIC node device.

#  virsh nodedev-list --tree|more
computer
 |
  +- net_lo_00_00_00_00_00_00
  +- net_virbr0_nic_52_54_00_f6_8a_ba
  +- net_vnet0_fe_54_00_ae_6e_74
  +- pci_0000_00_00_0
  +- pci_0000_00_01_0
  |   |
  |   +- pci_0000_01_00_0
  |     
  +- pci_0000_00_03_0
  +- pci_0000_00_03_2
  +- pci_0000_00_03_3
  +- pci_0000_00_19_0
  |   |
  |   +- net_eth0_00_21_9b_7d_f9_71
  |     
.....................................

7.Add the following lines to domain xml.

<hostdev mode='subsystem' type='pci' managed='yes'>
 <source>
  <address bus='0' slot='0x19' function='0'/>
 </source>
</hostdev>

8. Start the vm

9. Check svirt label of the qemu-kvm process.
# ps -efZ|grep qemu-kvm
system_u:system_r:svirt_t:s0:c100,c200 qemu 4227   1 35 11:46 ?      
................................

10.Check the context of pci device is the same as the context of qemu-kvm process
# ll -Z /sys/bus/pci/devices/0000:00:19.0/resource
-r--r--r--. qemu qemu system_u:object_r:sysfs_t:s0     /sys/bus/pci/devices/0000:00:19.0/resource

  
Actual results:
PCI devices resource's sVirt label is different as set in virt-manager Security page.

Expected results:
PCI devices resource's sVirt label should be same as set in virt-manager Security page.