selftests: forwarding: dual_vxlan_bridge: Disable IPv6 autogen on bridges

In a future patch, mlxsw will start adding RIFs to uppers of front panel
port netdevices, if they have an IP address.

This will cause this selftest to fail spuriously. The swp enslavement to
the 802.1ad bridge is not allowed, because RIFs are not allowed to be
created for 802.1ad bridges, but the address indicates one needs to be
created.

Fix by disabling automatic IPv6 address generation for the HW-offloaded
bridge in this selftest, thus exempting it from mlxsw router attention.

Signed-off-by: Petr Machata <[e-mail]>
Reviewed-by: Amit Cohen <[e-mail]>
Signed-off-by: Jakub Kicinski <[e-mail]>

tools/testing/selftests/net/forwarding/dual_vxlan_bridge.sh

···
 	#### BR1 ####
 	ip link add name br1 type bridge vlan_filtering 1 \
 		vlan_protocol 802.1ad vlan_default_pvid 0 mcast_snooping 0
+	ip link set dev br1 addrgenmode none
 	# Make sure the bridge uses the MAC address of the local port and not
 	# that of the VxLAN's device.
 	ip link set dev br1 address $(mac_get $swp1)