[Bridge] 2.6.12-rc4-bridge

[Stephen Hemminger]

http://developer.osdl.org/shemminger/patches/2.6.12-rc4-bridge/

Here are some patches for requested features, given basic testing but
need more testing before they are publicly ready:

bridge-csum - turn on bridge pseudo-device flags so that smart hardware
	              does less work. Helps Xen

bridge-flush - add /sys/class/net/brX/bridge/flush write only hook to flush
	              forwarding database entries

bridge-setmac - allow setting device address to force bridge_id.
	                  setting to zero forces recalculation