Add global random seed config

This is needed to make fuzzy tests work with xdist as each
xdist gateway expects to receive the same set of parameter
values, which for random generators may be achieved only by
providing globally shared seed.

Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>

tests/functional/utils/configure_random.py

@@ -0,0 +1,13 @@
+#!/usr/bin/env python3
+
+#
+# Copyright(c) 2012-2018 Intel Corporation
+# SPDX-License-Identifier: BSD-3-Clause-Clear
+#
+
+import sys
+import random
+
+
+with open("config/random.cfg", "w") as f:
+    f.write(str(random.randint(0, sys.maxsize)))