change imports with osm_nbi prefix

Change-Id: I4dcbfc71d900269f28ceec6669fe4127bc6a29fc
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/osm_nbi/subscriptions.py b/osm_nbi/subscriptions.py
index 156f466..39eed76 100644
--- a/osm_nbi/subscriptions.py
+++ b/osm_nbi/subscriptions.py
@@ -27,7 +27,7 @@
 from osm_common import dbmongo, dbmemory, msglocal, msgkafka
 from osm_common.dbbase import DbException
 from osm_common.msgbase import MsgException
-from engine import EngineException
+from osm_nbi.engine import EngineException
 
 __author__ = "Alfonso Tierno <alfonso.tiernosepulveda@telefonica.com>"