Prove out multi-endpoint testing

multi/base.yaml looks at both the compute and placement services,
confirming that the one hypervisor that exists has a resource
provider with inventory with a proper allocation ratio for VCPU.

It turns out that each of the <TYPE>_SERVICE ENVIRON variables also
needs a <TYPE>_BASE otherwise it can be hard to reconstruct URLs
using links in respones. Sometimes they are full hosts. Sometimes
they are absolute URLs. Neither of this can be appended to a fully
qualified endpoint.

gabbi_tempest/tests/scenario/__init__.py

@@ -46,6 +46,8 @@ class GenericGabbiTest(tempest.test.BaseTestCase):
         for service_type, url in endpoints.items():
             name = '%s_SERVICE' % service_type.upper()
             os.environ[name] = url
+            name = '%s_BASE' % service_type.upper()
+            os.environ[name] = '://'.join(urlparse.urlparse(url)[0:2])
         os.environ['SERVICE_TOKEN'] = token
 
         if cls.service_type in endpoints:
@@ -120,3 +122,9 @@ class GlanceGabbiTest(GenericGabbiTest):
     credentials = ['admin']
     service_name = 'glance'
     service_type = 'image'
+
+
+class PlacementNovaGabbiTest(GenericGabbiTest):
+    credentials = ['admin']
+    service_name = 'nova'
+    service_type = 'multi'

gabbi_tempest/tests/scenario/gabbits/multi/base.yaml

@@ -0,0 +1,26 @@
+
+defaults:
+    request_headers:
+        x-auth-token: $ENVIRON['SERVICE_TOKEN']
+        content-type: application/json
+        accept: application/json
+        openstack-api-version: 'compute latest, placement latest'
+
+tests:
+
+    - name: list hypervisors
+      GET: $ENVIRON['COMPUTE_SERVICE']/os-hypervisors
+      response_json_paths:
+          $.hypervisors.`len`: 1
+
+    - name: confirm resource provider
+      GET: $ENVIRON['PLACEMENT_SERVICE']/resource_providers/$RESPONSE['$.hypervisors[0].id']
+      response_json_paths:
+          $.uuid: $RESPONSE['$.hypervisors[0].id']
+
+    - name: blargh inventory
+      verbose: True
+      GET: $ENVIRON['PLACEMENT_BASE']$RESPONSE['$.links[?rel=inventories].href']
+      response_json_paths:
+          $.inventories.VCPU.allocation_ratio: 16
+