tools: remove unneeded temp directory handling

The handling of temp directory creation happens in common.js now so
there is no need to test the creation of the temp directory in test.py.

Author: Trott

tools/test.py

@@ -1562,15 +1562,8 @@ def Main():
     for rule in globally_unused_rules:
       print "Rule for '%s' was not used." % '/'.join([str(s) for s in rule.path])
 
-  tempdir = os.environ.get('NODE_TEST_DIR') or options.temp_dir
-  if tempdir:
-    try:
-      os.makedirs(tempdir)
-      os.environ['NODE_TEST_DIR'] = tempdir
-    except OSError as exception:
-      if exception.errno != errno.EEXIST:
-        print "Could not create the temporary directory", options.temp_dir
-        sys.exit(1)
+  if not os.environ.get('NODE_TEST_DIR') and options.temp_dir:
+    os.environ['NODE_TEST_DIR'] = options.temp_dir
 
   if options.report:
     PrintReport(all_cases)