feature 5956. Split engine in several files

Change-Id: Ic3d34ae632addd4563b94baad505b87b3cab9ec4
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/tox.ini b/tox.ini
index 0207a67..b864700 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,8 +10,8 @@
 [testenv:flake8]
 basepython = python3
 deps = flake8
-commands =
-    flake8 osm_nbi/ setup.py --max-line-length 120 --exclude .svn,CVS,.gz,.git,__pycache__,.tox,local,temp,vnfd_catalog.py,nsd_catalog.py --ignore W291,W293,E226
+commands = flake8 osm_nbi/ setup.py --max-line-length 120 \
+    --exclude .svn,CVS,.gz,.git,__pycache__,.tox,local,temp,vnfd_catalog.py,nsd_catalog.py --ignore W291,W293,E226,E402
 
 [testenv:build]
 basepython = python3