VPP_Device Functional

CSIT-1901 added new VPP_Device test environment for functional VPP device tests integrated into LFN CI/CD infrastructure. VPP_Device tests run on 1-Node testbeds (1n-skx, 1n-arm) and rely on Linux SRIOV Virtual Function (VF), dot1q VLAN tagging and external loopback cables to facilitate packet passing over exernal physical links. Initial focus is on few baseline tests. Existing CSIT VIRL tests can be moved to VPP_Device framework by changing L1 and L2 KW(s). RF test definition code stays unchanged with the exception of requiring adjustments from 3-Node to 2-Node logical topologies. CSIT VIRL to VPP_Device migration is expected in the next CSIT release.