Description of problem:

On current up to date F7 the virbr0 interface for virtual machines is not 
created with selinux in enforcing mode.

Version-Release number of selected component (if applicable):
selinux-policy-2.6.4-29.fc7

How reproducible:
Completely.


Steps to Reproduce:
1. Boot F7 system, starting libvirtd
2. Inspect list of network interfaces.

Also, 'service libvirtd restart' also generates the same error.

Actual results:
No virbr0 appears

Expected results:
libvirtd sets up virbr0

Additional info:
Booting the system with enforcing=0 works as expected, and the virbr0 bridge 
interface is created. With selinux in enforcing mode the interface is not 
created (though libvirtd otherwise starts up), and se-troubleshoot reports:
 "SELinux is preventing /usr/sbin/brctl (brctl_t) "getattr" to /sys/class/net
/virbr0/bridge/forward_delay (sysfs_t)." (corresponding sealert output 
attached).