Create temp directories in "test" dir

Don't create the temp dirs in the current directory, but create them in
the same directory as the credentials.conf file is. We still need to
prevent deleting them on test failure, so that they can be inspected
manually.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>

test/OLItest/TestRunner.py

@@ -50,9 +50,10 @@ class OLITestLib():
         directory at a time. OLITestLib is not suited for running
         several tests in parallel.  The user is responsible for
         cleaning that up herself."""
-        # creating temporary directory for testing in current dir
+        # creating temporary dir for testing in same dir as credentials.conf
         cls.testdir = os.path.abspath(
-            tempfile.mkdtemp(prefix='tmp_%s_'%suffix, dir='.'))
+            tempfile.mkdtemp(prefix='tmp_%s_'%suffix,
+                             dir=os.path.dirname(cls.cred_file)))
         cls.create_config_file()
         return cls.testdir