fix for invalid mgmt vld

hackfest_basic_sriov_ns/hackfest_basic_sriov_nsd.yaml

 nsd-catalog:
   nsd:
-  - constituent-vnfd:
-    - member-vnf-index: '1'
-      vnfd-id-ref: hackfest_basic_sriov-vnf
-    description: Simple NS with a single VNF with SRIOV port
-    id: hackfest_basic_sriov-ns
-    name: hackfest_basic_sriov-ns
-    short-name: hackfest_basic_sriov-ns
-    version: '1.0'
-    vld:
-    - id: mgmtnet
-      mgmt-network: true
-      name: mgmtnet
-      short-name: mgmtnet
-      type: ELAN
-      vnfd-connection-point-ref:
-      - member-vnf-index-ref: '1'
-        vnfd-connection-point-ref: vnf-cp0
-        vnfd-id-ref: hackfest_basic_sriov-vnf
-    - id: sriov_vld
-      mgmt-network: true
-      name: sriov_vld
-      short-name: sriov_vld
-      type: ELAN
-      vnfd-connection-point-ref:
-      - member-vnf-index-ref: '1'
-        vnfd-connection-point-ref: vnf-cp1
-        vnfd-id-ref: hackfest_basic_sriov-vnf
\ No newline at end of file
+    - constituent-vnfd:
+        - member-vnf-index: "1"
+          vnfd-id-ref: hackfest_basic_sriov-vnf
+      description: Simple NS with a single VNF with SRIOV port
+      id: hackfest_basic_sriov-ns
+      name: hackfest_basic_sriov-ns
+      short-name: hackfest_basic_sriov-ns
+      version: "1.0"
+      vld:
+        - id: mgmtnet
+          mgmt-network: true
+          name: mgmtnet
+          short-name: mgmtnet
+          type: ELAN
+          vnfd-connection-point-ref:
+            - member-vnf-index-ref: "1"
+              vnfd-connection-point-ref: vnf-cp0
+              vnfd-id-ref: hackfest_basic_sriov-vnf
+        - id: sriov_vld
+          name: sriov_vld
+          short-name: sriov_vld
+          type: ELAN
+          vnfd-connection-point-ref:
+            - member-vnf-index-ref: "1"
+              vnfd-connection-point-ref: vnf-cp1
+              vnfd-id-ref: hackfest_basic_sriov-vnf