Return complete response from servers_client

Currently compute servers_client returns Response by
removing top key from Response.
For example-
 return service_client.ResponseBody(resp, body['server'])

As service clients are in direction to move to Tempest-lib, all
service clients should return Response without any truncation.
One good example is Resource pagination links which are lost with current
way of return value. Resource pagination links are present in parallel
(not inside) to top key of Response.

This patch makes compute servers_client to return
complete Response body.

Change-Id: I6a7b5c6144cafcb8f0780db01bf67999a4229389
Implements: blueprint method-return-value-and-move-service-clients-to-lib
diff --git a/tempest/api/compute/servers/test_server_addresses.py b/tempest/api/compute/servers/test_server_addresses.py
index a17f581..864f38f 100644
--- a/tempest/api/compute/servers/test_server_addresses.py
+++ b/tempest/api/compute/servers/test_server_addresses.py
@@ -45,7 +45,7 @@
         # All public and private addresses for
         # a server should be returned
 
-        addresses = self.client.list_addresses(self.server['id'])
+        addresses = self.client.list_addresses(self.server['id'])['addresses']
 
         # We do not know the exact network configuration, but an instance
         # should at least have a single public or private address
@@ -63,7 +63,7 @@
         # Providing a network type should filter
         # the addresses return by that type
 
-        addresses = self.client.list_addresses(self.server['id'])
+        addresses = self.client.list_addresses(self.server['id'])['addresses']
 
         # Once again we don't know the environment's exact network config,
         # but the response for each individual network should be the same