Fix support of multi-segment networks in Openstack; added created_items in all vimconns

Change-Id: I641a337e58138d693970616360dfb9aab021fd2a
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/requirements.txt b/requirements.txt
index 6e1068a..05d96bb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,6 +11,7 @@
 python-keystoneclient
 python-glanceclient
 python-neutronclient
+networking-l2gw
 python-cinderclient
 pyvcloud==19.1.1
 pyvmomi