VPP Performance Changes 3n-skx 2t1c ndr

Legend to Table:
YYMM.V-E - tested VPP version (YY year, MM month, V minor version) and CSIT test environment version (E environment version, “2” for 2020-03-27).
Diff - difference between 1908.1-2 and 1908.2-2 VPP version.