Add base test script

This test script comes partially from release/xs8 branch.
The intention is to have some common way to launch tests.
This allows, for instance, to execute tests from packaging
tools (like RPM spec files) using the same code.

Signed-off-by: Frediano Ziglio <frediano.ziglio@cloud.com>

Author: Frediano Ziglio

test/test.sh

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+export PYTHONPATH="$(realpath $(dirname $0))":"$(realpath $(dirname $0)/..)":"$PYTHONPATH"
+
+cd "$(realpath $(dirname $0))"
+PYTHON=python2
+if  head -1 ../init | grep -q python3; then
+	PYTHON=python3
+fi
+$PYTHON test_errors.py -v