Make quotas_client use **kwargs

As we discussed on
http://lists.openstack.org/pipermail/openstack-dev/2015-July/068864.html
All http POST/PUT methods need to contain **kwargs as their arguments.
This patch makes quotas_client use **kwargs.

Partially implements blueprint consistent-service-method-names

Change-Id: I47b52a513dc794242e0a07201c05a0b4d4f37033
diff --git a/tempest/services/compute/json/quotas_client.py b/tempest/services/compute/json/quotas_client.py
index 4ea47ed..88d0567 100644
--- a/tempest/services/compute/json/quotas_client.py
+++ b/tempest/services/compute/json/quotas_client.py
@@ -41,59 +41,11 @@
         self.validate_response(schema.get_quota_set, resp, body)
         return service_client.ResponseBody(resp, body['quota_set'])
 
-    def update_quota_set(self, tenant_id, user_id=None,
-                         force=None, injected_file_content_bytes=None,
-                         metadata_items=None, ram=None, floating_ips=None,
-                         fixed_ips=None, key_pairs=None, instances=None,
-                         security_group_rules=None, injected_files=None,
-                         cores=None, injected_file_path_bytes=None,
-                         security_groups=None):
+    def update_quota_set(self, tenant_id, user_id=None, **kwargs):
         """
         Updates the tenant's quota limits for one or more resources
         """
-        post_body = {}
-
-        if force is not None:
-            post_body['force'] = force
-
-        if injected_file_content_bytes is not None:
-            post_body['injected_file_content_bytes'] = \
-                injected_file_content_bytes
-
-        if metadata_items is not None:
-            post_body['metadata_items'] = metadata_items
-
-        if ram is not None:
-            post_body['ram'] = ram
-
-        if floating_ips is not None:
-            post_body['floating_ips'] = floating_ips
-
-        if fixed_ips is not None:
-            post_body['fixed_ips'] = fixed_ips
-
-        if key_pairs is not None:
-            post_body['key_pairs'] = key_pairs
-
-        if instances is not None:
-            post_body['instances'] = instances
-
-        if security_group_rules is not None:
-            post_body['security_group_rules'] = security_group_rules
-
-        if injected_files is not None:
-            post_body['injected_files'] = injected_files
-
-        if cores is not None:
-            post_body['cores'] = cores
-
-        if injected_file_path_bytes is not None:
-            post_body['injected_file_path_bytes'] = injected_file_path_bytes
-
-        if security_groups is not None:
-            post_body['security_groups'] = security_groups
-
-        post_body = json.dumps({'quota_set': post_body})
+        post_body = json.dumps({'quota_set': kwargs})
 
         if user_id:
             resp, body = self.put('os-quota-sets/%s?user_id=%s' %