Adding policy support for ceilometer

Adding default policy json file for ceilometer which is very sparse.
Configuring access to metering panel to be RBAC gated. Using the
appropriate policy checks to load the panel.

Change-Id: Iad3ffe9d73fb994b146637e714c7d8c46102e104
Closes-Bug: #1419193
Partially-Closes: #1161144

openstack_dashboard/conf/ceilometer_policy.json

@@ -0,0 +1,6 @@
+{
+    "context_is_admin": "role:admin",
+    "context_is_project": "project_id:%(target.project_id)s",
+    "context_is_owner": "user_id:%(target.user_id)s",
+    "segregation": "rule:context_is_admin"
+}

openstack_dashboard/dashboards/admin/metering/panel.py

@@ -19,7 +19,9 @@ from openstack_dashboard.dashboards.admin import dashboard
 class Metering(horizon.Panel):
     name = _("Resource Usage")
     slug = 'metering'
-    permissions = ('openstack.services.metering', 'openstack.roles.admin', )
+    permissions = ('openstack.services.metering', )
+    policy_rules = (('telemetry', 'telemetry:compute_statistics'),
+                    ('telemetry', 'telemetry:get_meter'),)
 
 
 dashboard.Admin.register(Metering)

openstack_dashboard/settings.py

@@ -223,6 +223,7 @@ POLICY_FILES = {
     'image': 'glance_policy.json',
     'orchestration': 'heat_policy.json',
     'network': 'neutron_policy.json',
+    'telemetry': 'ceilometer_policy.json',
 }
 
 SECRET_KEY = None