board/common: override ifupdown2 addons.conf

We will not use features like batman, vxrd, or openvswitch.  Also, the
clagd and vxrd addons are not in ifupdown2, so likely proprietary ext.
by Cumulus.  Dropping them makes "unknown addon" warnings go away.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

board/common/rootfs/etc/network/ifupdown2/addons.conf

@@ -0,0 +1,37 @@
+pre-up,xfrm
+pre-up,link
+pre-up,ppp
+pre-up,bond
+pre-up,vlan
+pre-up,vxlan
+pre-up,usercmds
+pre-up,bridge
+pre-up,bridgevlan
+pre-up,mstpctl
+pre-up,tunnel
+pre-up,vrf
+pre-up,ethtool
+pre-up,address
+up,dhcp
+up,address
+up,addressvirtual
+up,usercmds
+post-up,usercmds
+pre-down,ethtool
+pre-down,usercmds
+pre-down,dhcp
+down,ppp
+down,addressvirtual
+down,address
+down,usercmds
+post-down,vrf
+post-down,mstpctl
+post-down,bridgevlan
+post-down,bridge
+post-down,vxlan
+post-down,vlan
+post-down,bond
+post-down,usercmds
+post-down,link
+post-down,tunnel
+post-down,xfrm