tests: move "venv" to "build-root" directory from "test" directory

Type: refactor

- refactored VPP test code to remove "ignore_path" variable
  from "discover_tests" function and "run_test" code
- configured VPP test makefile, config file, and 'run.sh' shell script
  to move "venv" directory from "test" dir to "build-root" dir

Signed-off-by: Saima Yunus <yunus.saima.234@gmail.com>
Change-Id: Id2beecbb99f24ce13ed118a1869c5adbef247e50

test/discover_tests.py

@@ -7,14 +7,12 @@ import importlib
 import argparse
 
 
-def discover_tests(directory, callback, ignore_path):
+def discover_tests(directory, callback):
     do_insert = True
     for _f in os.listdir(directory):
         f = "%s/%s" % (directory, _f)
         if os.path.isdir(f):
-            if ignore_path is not None and f.startswith(ignore_path):
-                continue
-            discover_tests(f, callback, ignore_path)
+            discover_tests(f, callback)
             continue
         if not os.path.isfile(f):
             continue