pyflakes: Remove imports of unused modules

Change-Id: I7496030e5857078cd66a36a5e46c9a50217ce6e3
diff --git a/src/osmo_gsm_tester/osmo_ggsn.py b/src/osmo_gsm_tester/osmo_ggsn.py
index 2fdc792..0ece596 100644
--- a/src/osmo_gsm_tester/osmo_ggsn.py
+++ b/src/osmo_gsm_tester/osmo_ggsn.py
@@ -20,7 +20,7 @@
 import os
 import pprint
 
-from . import log, util, config, template, process, osmo_ctrl, pcap_recorder
+from . import log, util, config, template, process, pcap_recorder
 
 class OsmoGgsn(log.Origin):