make test: VCL extended test cases

make test: VCL extended test cases

- Add VCL cut thru uni-direction test over multiple sockets
- Add VCL cut thru bi-direction test over multiple sockets
- Add LDP cut thru uni-directional test over multiple sockets
- Add LDP cut thru bi-directional test over multiple sockets
- Add VCL thru host stack uni-direction test over multiple sockets
- Add VCL thru host stack bi-direction test over multiple sockets
- Add LDP thru host stack uni-directional test over multiple sockets
- Add LDP thru host stack bi-directional test over multiple sockets
- Fix validateResults to ensure worker_server process is killed if
  it still exists after running the test.

Change-Id: I77ea9acef172667558dbcec23af1e4c72b29f376
Signed-off-by: Dave Wallace <dwallacelf@gmail.com>