Implement L2BD KWs for 2-node topology:

resources/libraries/robot/l2/l2_bridge_domain.robot:
Configure path for 2-node BD-SHG test
Set interfaces in 2-node BD-SHG test up

resources/libraries/robot/l2/tagging.robot:
Initialize VLAN sub-interfaces in 2-node circular topology

resources/libraries/robot/performance/performance_configuration.robot:
Initialize L2 bridge domain in 2-node circular topology
Initialize L2 bridge domain with IPv4 ACLs on DUT1 in 2-node circular topology
Initialize L2 bridge domain with MACIP ACLs on DUT1 in 2-node circular topology
Initialize L2 bridge domains with Vhost-User in 2-node circular topology
Initialize L2 bridge domains with Vhost-User for '${nr}' VMs in 2-node circular topology
Initialize L2 bridge domain with VXLANoIPv4 in 2-node circular topology
Initialize L2 bridge domains with Vhost-User and VXLANoIPv4 in 2-node circular topology
Initialize L2 bridge domains with VLAN dot1q sub-interfaces in a 2-node circular topology
Initialize L2 bridge domains with Vhost-User and VLAN in a 2-node circular topology
Initialize L2 bridge domains with Vhost-User and VLAN with DPDK link bonding in a 2-node circular topology
Initialize L2 bridge domains with Vhost-User and VLAN with VPP link bonding in a 2-node circular topology