Refactor fixed_ips API response schema

- Rename fixed_ips -> get_fixed_ip
- Rename fixed_ip_action -> reserve_fixed_ip

Partially implements blueprint rearrange-nova-response-schemas
Change-Id: If95988306ad0efdf4dd22e47a6623623f34503d9
diff --git a/tempest/api_schema/response/compute/v2_1/fixed_ips.py b/tempest/api_schema/response/compute/v2_1/fixed_ips.py
index 446633f..13e70bf 100644
--- a/tempest/api_schema/response/compute/v2_1/fixed_ips.py
+++ b/tempest/api_schema/response/compute/v2_1/fixed_ips.py
@@ -12,7 +12,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-fixed_ips = {
+get_fixed_ip = {
     'status_code': [200],
     'response_body': {
         'type': 'object',
@@ -35,7 +35,7 @@
     }
 }
 
-fixed_ip_action = {
+reserve_fixed_ip = {
     'status_code': [202],
     'response_body': {'type': 'string'}
 }
diff --git a/tempest/services/compute/json/fixed_ips_client.py b/tempest/services/compute/json/fixed_ips_client.py
index dda940c..7ba424f 100644
--- a/tempest/services/compute/json/fixed_ips_client.py
+++ b/tempest/services/compute/json/fixed_ips_client.py
@@ -25,12 +25,12 @@
         url = "os-fixed-ips/%s" % (fixed_ip)
         resp, body = self.get(url)
         body = json.loads(body)
-        self.validate_response(schema.fixed_ips, resp, body)
+        self.validate_response(schema.get_fixed_ip, resp, body)
         return service_client.ResponseBody(resp, body['fixed_ip'])
 
     def reserve_fixed_ip(self, ip, body):
         """This reserves and unreserves fixed ips."""
         url = "os-fixed-ips/%s/action" % (ip)
         resp, body = self.post(url, json.dumps(body))
-        self.validate_response(schema.fixed_ip_action, resp, body)
+        self.validate_response(schema.reserve_fixed_ip, resp, body)
         return service_client.ResponseBody(resp)