brctl setfd virbr0 0.1 by default?

[Warren Togami]

https://bugzilla.redhat.com/show_bug.cgi?id=435757
Sometime after F8, something changed where stuff attached to a bridge 
fails to connect until 15 seconds later.  A manual workaround of brctl 
setfd BRIDGENAME 0.1 makes stuff work immediately.

Are there any reasons why don't we do this by default for virbr0 in libvirt?

Use cases:
- Attach a different tun/tap device to the virbr0 bridge to talk to your 
virtual machine.
- Attach ethX real device to your vribr0 bridge to talk to your virtual 
machine without NAT (like if you are doing DHCP.)

Warren Togami
wtogami at redhat.com