[CONFIG] Correct port/interface name mapping for buffalo routers

Hardware port number are in the opposit order than what is
indicated on the router. The correct mapping is as follows.
Port 1 -> Ethernet no 4
Port 2 -> Ethernet no 3
Port 3 -> Ethernet no 2
Port 4 -> Ethernet no 1
[BUGFIX] Prevent bird6/ospf from using eth0

Packets sent over eth0 seems to get out throught the first ethernet port.
With no better idea about how to fix that, this patch will solve
the issue.
Got rid of 6relayd correctly.
Using latest version of bird-elsa, with bug patched.
Merge pull request #4 from Oryon/netgear

Netgear
Updated Buffalo- and Netgear config files.
Merge remote-tracking branch 'origin/netgear' into owrt-trunk
Netgear-specific bird6.conf from Pierre isn't really needed in owrt-trunk.