CRUD on flavor extra spec extension should be admin-only

Changes the default policy.json file to make the flavor extra
spec create/update/delete operations admin-only, since the
flavormanage extension is admin-only.

fixes: lp bug #1094142

Change-Id: Ic464b17130e76565a7c475e59064e3e3e8861327

etc/nova/policy.json

@@ -46,7 +46,11 @@
     "compute_extension:flavor_rxtx": "",
     "compute_extension:flavor_swap": "",
     "compute_extension:flavorextradata": "",
-    "compute_extension:flavorextraspecs": "",
+    "compute_extension:flavorextraspecs:index": "",
+    "compute_extension:flavorextraspecs:show": "",
+    "compute_extension:flavorextraspecs:create": "rule:admin_api",
+    "compute_extension:flavorextraspecs:update": "rule:admin_api",
+    "compute_extension:flavorextraspecs:delete": "rule:admin_api",
     "compute_extension:flavormanage": "rule:admin_api",
     "compute_extension:floating_ip_dns": "",
     "compute_extension:floating_ip_pools": "",