Remove base_services_client for the reability

The service clients for the volume service are different from
the other services and it is a little difficult to read and
debug because that consists of multiple layers for v1 and v2.
That could be useful for the code optimization,  but actually
the merit seems small and unreadable.
This patch removes these layers from the volume clients.

Partially implements blueprint consistent-service-method-names

Change-Id: I06661fa4b0eb9ed961a4fd2cc9b89462ef45c271
diff --git a/tempest/services/volume/base/admin/base_services_client.py b/tempest/services/volume/base/admin/base_services_client.py
deleted file mode 100644
index 861eb92..0000000
--- a/tempest/services/volume/base/admin/base_services_client.py
+++ /dev/null
@@ -1,32 +0,0 @@
-# Copyright 2014 NEC Corporation
-# All Rights Reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-from oslo_serialization import jsonutils as json
-from six.moves.urllib import parse as urllib
-
-from tempest.lib.common import rest_client
-
-
-class BaseServicesClient(rest_client.RestClient):
-
-    def list_services(self, **params):
-        url = 'os-services'
-        if params:
-            url += '?%s' % urllib.urlencode(params)
-
-        resp, body = self.get(url)
-        body = json.loads(body)
-        self.expected_success(200, resp.status)
-        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v1/json/admin/services_client.py b/tempest/services/volume/v1/json/admin/services_client.py
index 2bffd55..d438a34 100644
--- a/tempest/services/volume/v1/json/admin/services_client.py
+++ b/tempest/services/volume/v1/json/admin/services_client.py
@@ -13,8 +13,21 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base.admin import base_services_client
+from oslo_serialization import jsonutils as json
+from six.moves.urllib import parse as urllib
+
+from tempest.lib.common import rest_client
 
 
-class ServicesClient(base_services_client.BaseServicesClient):
+class ServicesClient(rest_client.RestClient):
     """Volume V1 volume services client"""
+
+    def list_services(self, **params):
+        url = 'os-services'
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v2/json/admin/services_client.py b/tempest/services/volume/v2/json/admin/services_client.py
index db19ba9..bc55469 100644
--- a/tempest/services/volume/v2/json/admin/services_client.py
+++ b/tempest/services/volume/v2/json/admin/services_client.py
@@ -13,9 +13,22 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base.admin import base_services_client
+from oslo_serialization import jsonutils as json
+from six.moves.urllib import parse as urllib
+
+from tempest.lib.common import rest_client
 
 
-class ServicesClient(base_services_client.BaseServicesClient):
+class ServicesClient(rest_client.RestClient):
     """Client class to send CRUD Volume V2 API requests"""
     api_version = "v2"
+
+    def list_services(self, **params):
+        url = 'os-services'
+        if params:
+            url += '?%s' % urllib.urlencode(params)
+
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)