Return complete response from floating_ip_pools_client

Currently compute floating_ip_pools_client returns Response by removing
top key from Response.
For example-
return service_client.ResponseBodyList(resp, body['floating_ip_pools'])

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 floating_ip_pools_client to return complete
Response body.

Change-Id: I0adbaf5b69e0b6b9f2504151e4693d8048c21882
Implements: blueprint method-return-value-and-move-service-clients-to-lib
2 files changed