Add resources for neutron autoallocation test

Change-Id: I7c082e3300f1cd39e47d2756de3c1c8ec5371d44
Related-Prod: PROD-19736
diff --git a/metadata/service/tempest/neutron.yml b/metadata/service/tempest/neutron.yml
index de5f303..a85ab4e 100644
--- a/metadata/service/tempest/neutron.yml
+++ b/metadata/service/tempest/neutron.yml
@@ -24,3 +24,13 @@
                       end: 10.20.30.254
                   gateway: 10.20.30.1
                   enable_dhcp: True
+      resources:
+        v2:
+          admin_identity:
+            subnetpool:
+              default_pool:
+                default_prefixlen: 26
+                is_default: True
+                shared: True
+                prefixes:
+                  - 10.0.0.0/24