Fix Bug 1607 interface position is not taken into account

This fix provides to pass the position information to LCM.

Change-Id: Ic3ddc376932ad52e09205484202542b0c50a6cd3
Signed-off-by: aticig <gulsum.atici@canonical.com>
diff --git a/osm_nbi/instance_topics.py b/osm_nbi/instance_topics.py
index 57c7232..176f86d 100644
--- a/osm_nbi/instance_topics.py
+++ b/osm_nbi/instance_topics.py
@@ -896,7 +896,10 @@
                 vdur["internal-connection-point"].append(vdu_icp)
 
                 for iface in icp.get("virtual-network-interface-requirement", ()):
-                    iface_fields = ("name", "mac-address")
+                    # Name, mac-address and interface position is taken from VNFD
+                    # and included into VNFR. By this way RO can process this information
+                    # while creating the VDU.
+                    iface_fields = ("name", "mac-address", "position")
                     vdu_iface = {
                         x: iface[x] for x in iface_fields if iface.get(x) is not None
                     }