Feature 10509: Add support for scaling KDUs

- Add kdu-resource-profile: Profile that references to a particular
resource of a KDU (i.e. deployment/statefulset/etc. of a KDU).
- Add kdu-resource-delta: Delta list for the scaling-in and -out of a
KDU.
- Add vnfd_sol006_k8s_scale.yaml under tests/examples: Descriptor
example.

Change-Id: I6b159341216a54776049da4f6145f0c3e030ff12
Signed-off-by: David Garcia <david.garcia@canonical.com>
(cherry picked from commit b8c5953995f7c3e68602dae2f4770efc3b674dd2)
diff --git a/tests/test_validation.py b/tests/test_validation.py
index a9dc8a4..02b9efb 100644
--- a/tests/test_validation.py
+++ b/tests/test_validation.py
@@ -27,7 +27,8 @@
     'hackfest_charmed_vnfd_sol006.yaml',
     'magma_knf_sol006.yaml',
     'vepc_sol006.yaml',
-    'vnfd_sol006.yaml'
+    'vnfd_sol006.yaml',
+    'vnfd_sol006_k8s_scale.yaml',
 ]
 
 NSD_FILES = [