Add API tests for List and Get Allocation API

This patch adds API tests for List and Get host allocation API.

Partially Implements: blueprint resource-allocation-api
Change-Id: I597e163541776022c1152cab02f259c857b1a459

blazar_tempest_plugin/tests/api/gabbits/allocations.yaml

@@ -0,0 +1,71 @@
+fixtures:
+    - AuthenticationFixture
+
+defaults:
+  request_headers:
+    accept: application/json
+    content-type: application/json
+    X-Auth-Token: $ENVIRON['OS_TOKEN']
+
+tests:
+- name: get host name
+  GET: compute/v2.1/os-hypervisors
+  status: 200
+
+- name: post new host
+  POST: reservation/v1/os-hosts
+  data:
+      name: $HISTORY['get host name'].$RESPONSE['$.hypervisors[0].hypervisor_hostname']
+  status: 201
+
+- name: post new lease lease1
+  POST: reservation/v1/leases
+  data:
+    name: lease1
+    start_date: "2020-01-01 10:00"
+    end_date: "2020-01-01 11:00"
+    reservations:
+      - resource_type: physical:host
+        min: 1
+        max: 1
+        hypervisor_properties: "[]"
+        resource_properties: "[]"
+  status: 201
+
+- name: post new lease lease2
+  POST: reservation/v1/leases
+  data:
+    name: lease2
+    start_date: "2020-01-01 12:00"
+    end_date: "2020-01-01 13:00"
+    reservations:
+      - resource_type: physical:host
+        min: 1
+        max: 1
+        hypervisor_properties: "[]"
+        resource_properties: "[]"
+  status: 201
+
+- name: list host allocations
+  GET: reservation/v1/os-hosts/allocations
+  response_json_paths:
+    $.allocations..reservations.`len`: 2
+
+- name: list host allocations with lease2
+  GET: reservation/v1/os-hosts/allocations
+  query_parameters:
+    lease_id: $HISTORY['post new lease lease2'].$RESPONSE['$.lease.id']
+  response_json_paths:
+    $.allocations.`len`: 1
+
+- name: delete lease2
+  DELETE: reservation/v1/leases/$HISTORY['post new lease lease2'].$RESPONSE['$.lease.id']
+  status: 204
+
+- name: delete lease1
+  DELETE: reservation/v1/leases/$HISTORY['post new lease lease1'].$RESPONSE['$.lease.id']
+  status: 204
+
+- name: delete host
+  DELETE: reservation/v1/os-hosts/$HISTORY['post new host'].$RESPONSE['$.host.id']
+  status: 204