Add config file for rally-designate job

Currently this job may be triggered by 'check experimental' (when all
necessary patches are merged in openstack/infra)

Change-Id: Ia7004ec968350648bc32d72af7a316b897853da7

rally-scenarios/rally-designate.yaml

@@ -0,0 +1,59 @@
+---
+  DesignateBasic.create_and_delete_domain:
+    -
+      runner:
+        type: "constant"
+        times: 10
+        concurrency: 10
+      context:
+        users:
+          tenants: 2
+          users_per_tenant: 2
+
+  DesignateBasic.create_and_delete_records:
+    -
+      args:
+        records_per_domain: 10
+      runner:
+        type: "constant"
+        times: 10
+        concurrency: 10
+      context:
+        users:
+          tenants: 2
+          users_per_tenant: 2
+
+  DesignateBasic.create_and_list_domains:
+    -
+      runner:
+        type: "constant"
+        times: 10
+        concurrency: 10
+      context:
+        users:
+          tenants: 2
+          users_per_tenant: 2
+
+  DesignateBasic.create_and_list_records:
+    -
+      args:
+        records_per_domain: 10
+      runner:
+        type: "constant"
+        times: 10
+        concurrency: 10
+      context:
+        users:
+          tenants: 2
+          users_per_tenant: 2
+
+  DesignateBasic.list_domains:
+    -
+      runner:
+        type: "constant"
+        times: 3
+        concurrency: 2
+      context:
+        users:
+          tenants: 2
+          users_per_tenant: 2