Python tests: Move security test stubs to correct location.

python/ql/test/query-tests/Security/lib/base64.py

@@ -0,0 +1,2 @@
+def decodestring(s):
+    return None

python/ql/test/query-tests/Security/lib/marshall.py

@@ -0,0 +1,2 @@
+def loads(*args, **kwargs):
+    return None

python/ql/test/query-tests/Security/lib/os/__init__.py

@@ -0,0 +1,2 @@
+def system(cmd, *args, **kwargs):
+    return None

python/ql/test/query-tests/Security/lib/os/path.py

@@ -0,0 +1,5 @@
+def join(a, *b):
+    return a + "/" + "/".join(b)
+
+def normpath(x):
+    return x

python/ql/test/query-tests/Security/lib/pickle.py

@@ -0,0 +1,2 @@
+def loads(*args, **kwargs):
+    return None

python/ql/test/query-tests/Security/lib/subprocess.py

@@ -0,0 +1,2 @@
+def Popen(*args, **kwargs):
+    return None

python/ql/test/query-tests/Security/lib/traceback.py

@@ -0,0 +1,2 @@
+def format_exc():
+    return None