Merge branch 'issue#4' into 'dev-v2.8.1'

Issue#4 - Implement NFVIFA(18)000627 - IFA011ed311 Remove element groups

See merge request !59

example-data/nfv-nsd.xml

-<nsd xmlns="urn:etsi:nfv:yang:etsi-nfv-nsd">
+<nfv xmlns="urn:etsi:nfv:yang:etsi-nfv-descriptors">
   <vnfd>
     <id>ASA</id>
     <provider>My Company</provider>
@@ -133,4 +133,4 @@
       </ns-instantiation-level>
     </df>
   </nsd>
-</config>
+</nfv>

src/yang/etsi-nfv-vnf.yang

@@ -2931,10 +2931,15 @@ submodule etsi-nfv-vnf {
     }
 
     list element-group {
+      status deprecated;
       key "id";
       description
         "Describes the associated elements of a VNFD for a certain
-         purpose during VNF lifecycle management.";
+         purpose during VNF lifecycle management.
+
+         Reason for deprecating this node - Information about which
+         VDU and VLD are involved in scaling is better defined by
+         ScalingDelta.";
       reference
         "GS NFV IFA011: Section 7.1.2 VNFD information element";