Adding support to different ingress and egress ports (SFC)

Change-Id: Idea50e7aabf330b1957e4086156a8f32340a1ece
Signed-off-by: Eduardo Sousa <esousa@whitestack.com>
diff --git a/models/yang/nsr.yang b/models/yang/nsr.yang
index 3547866..48ac592 100644
--- a/models/yang/nsr.yang
+++ b/models/yang/nsr.yang
@@ -507,7 +507,16 @@
                   path "../../../../../../vnfr:vnfr-catalog/vnfr:vnfr/vnfr:name";
                 }
           }
-          leaf vnfr-connection-point-ref {
+          leaf vnfr-ingress-connection-point-ref {
+            description
+                "A reference to a vnfr connection point.";
+            type leafref {
+              path "../../../../../../vnfr:vnfr-catalog/vnfr:vnfr"
+                 + "[vnfr:id = current()/../vnfr-id-ref]"
+                 + "/vnfr:connection-point/vnfr:name";
+            }
+          }
+          leaf vnfr-egress-connection-point-ref {
             description
                 "A reference to a vnfr connection point.";
             type leafref {