rename dns cache test to cache test, refs #20701

tester.py

@@ -162,7 +162,7 @@ class Tester():
             etc_lives_conf = '/etc/mediaserver/lives_conf.py'
             local_lives_conf = '/home/%s/msinstance/conf/lives_conf.py'
             for user in ms_users:
-                ms_tests = ['ms_vod_tester.py', 'test_caches_dns.py']
+                ms_tests = ['ms_vod_tester.py', 'test_caches.py']
                 # Check if live tests should be started
                 if os.path.exists(wowza_dir) or os.path.exists(etc_lives_conf) or os.path.exists(local_lives_conf % user):
                     ms_tests.append('test_wowza_secure.py')