make policy-id optional

for legacy operational policies, PAP does not populate the
metadata.policy-id field.   The metadata structure is empty.

Issue-ID: POLICY-2356
Signed-off-by: jhh <jorge.hernandez-herrero@att.com>
Change-Id: Ib726c935a9ea344577dc58638bdd39192c7a10d1
diff --git a/policy-domains/src/main/resources/schemas/onap.policies.controlloop.Operational-1.0.0.schema.json b/policy-domains/src/main/resources/schemas/onap.policies.controlloop.Operational-1.0.0.schema.json
index 820bdd7..0b52fe3 100644
--- a/policy-domains/src/main/resources/schemas/onap.policies.controlloop.Operational-1.0.0.schema.json
+++ b/policy-domains/src/main/resources/schemas/onap.policies.controlloop.Operational-1.0.0.schema.json
@@ -53,9 +53,7 @@
             "$id": "#/properties/metadata",
             "type": "object",
             "title": "Metadata",
-            "required": [
-                "policy-id"
-            ],
+            "required": [],
             "properties": {
                 "policy-id": {
                     "$id": "#/properties/metadata/properties/policy-id",