Ticket 83 - Fix create_test.py imports

Description:  The import for "os" was removed, but it is needed in every test script

https://pagure.io/lib389/issue/83

Reviewed by: mreynolds(one line commit rule)

dirsrvtests/create_test.py

@@ -212,7 +212,7 @@ if len(sys.argv) > 0:
     else:
         topology_import = ''
 
-    TEST.write('import logging\nimport pytest\n')
+    TEST.write('import logging\nimport pytest\nimport os\n')
     TEST.write('{}\n'.format(topology_import))
 
     TEST.write('DEBUGGING = os.getenv("DEBUGGING", default=False)\n')