User can LD_PRELOAD any application that uses POSIX socket API.
NOTE: The sources have been moved to .../vpp/src/vcl and libvcl_ldpreload.so is built with VPP and can be found in .../vpp/build-root/install-vpp[_debug]-native/vpp/lib
export WS_ROOT= (e.g. /scratch/my_name/vpp) $WS_ROOT/test/scripts/socket_test.sh
$WS_ROOT/test/scripts/socket_test.sh -bi docker-kernel
$WS_ROOT/test/scripts/socket_test.sh -bi docker-preload