Merge branch 'issue#20' into 'dev-v3.3.1'

Issue #20. Back out changes committed in issue#11

See merge request !77

src/yang/etsi-nfv-ns.yang

@@ -1688,22 +1688,6 @@ submodule etsi-nfv-ns {
         }
       }
 
-      leaf priority {
-        type uint32;
-        description
-          "Specifies the priority for the NS instance.
-
-           The allowed range will be reasonably high. The 'zero'
-           value will express the highest priority and the fact
-           that the NS instance based on this DF cannot be
-           pre-empted during resource allocation.
-
-           Examples for the usage of priority include conflict
-           resolution in case of resource shortage.";
-        reference
-          "GS NFV IFA014: Section 6.3.2.2 NsDf information element";
-      }
-
       leaf service-availability-level {
         type uint32;
         description