Remove CONF values from compute clients

To move compute clients to tempest-lib, this patch moves
CONF values from compute clients to the client setting.

Change-Id: I740d7c20a7b3139b71d120f53bb4764cf51e95e3
diff --git a/tempest/services/compute/json/floating_ips_client.py b/tempest/services/compute/json/floating_ips_client.py
index 788b4d2..9c586e3 100644
--- a/tempest/services/compute/json/floating_ips_client.py
+++ b/tempest/services/compute/json/floating_ips_client.py
@@ -17,11 +17,11 @@
 import urllib
 
 from tempest.api_schema.response.compute.v2 import floating_ips as schema
+from tempest.common import service_client
 from tempest import exceptions
-from tempest.services.compute.json import base
 
 
-class FloatingIPsClientJSON(base.ComputeClient):
+class FloatingIPsClientJSON(service_client.ServiceClient):
 
     def list_floating_ips(self, params=None):
         """Returns a list of all floating IPs filtered by any parameters."""