TMSS-139: little rename

SAS/TMSS/test/tmss_database_unittest_setup.py

@@ -26,9 +26,9 @@ which is automatically destroyed at the end of the unittest session.
 # import and start an isolated TMSSTestDatabaseInstance (with fresh database)
 # this automagically sets the required  DJANGO_SETTINGS_MODULE and TMSS_DBCREDENTIALS envvars.
 from lofar.sas.tmss.test.test_utils import TMSSTestDatabaseInstance
-_tmss_test_db_instance = TMSSTestDatabaseInstance()
-_tmss_test_db_instance.create()
+tmss_test_db_instance = TMSSTestDatabaseInstance()
+tmss_test_db_instance.create()
 
 # tell unittest to stop (and automagically cleanup) the test database once all testing is done.
 def tearDownModule():
-    _tmss_test_db_instance.destroy()
+    tmss_test_db_instance.destroy()