Adding upstream version 3.1.0+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

tests/perf/perf.yang

@@ -0,0 +1,27 @@
+module perf {
+    yang-version 1.1;
+    namespace "urn:sysrepo:tests:perf";
+    prefix p;
+
+    container cont {
+        list lst {
+            key "k1 k2";
+
+            leaf k1 {
+                type uint32;
+            }
+
+            leaf k2 {
+                type string;
+            }
+
+            leaf l {
+                type string;
+            }
+
+            leaf-list lfl {
+                type uint32;
+            }
+        }
+    }
+}