Remove services/volume/{v1,v2} directories

Since volume clients v1 and v2  have migrated under lib/services libery,
We do not neet these directories anymore.

Change-Id: Icbbce7622c9e0b8179c8311554d4401b9b68e369
diff --git a/tempest/lib/services/clients.py b/tempest/lib/services/clients.py
index adf666b..2e5c457 100644
--- a/tempest/lib/services/clients.py
+++ b/tempest/lib/services/clients.py
@@ -25,6 +25,7 @@
 from tempest.lib.services import compute
 from tempest.lib.services import image
 from tempest.lib.services import network
+from tempest.lib.services import volume
 
 
 LOG = logging.getLogger(__name__)
@@ -40,7 +41,9 @@
         'compute': compute,
         'image.v1': image.v1,
         'image.v2': image.v2,
-        'network': network
+        'network': network,
+        'volume.v1': volume.v1,
+        'volume.v2': volume.v2
     }
 
 
@@ -49,8 +52,7 @@
     # NOTE(andreaf) This list will exists only as long the remain clients
     # are migrated to tempest.lib, and it will then be deleted without
     # deprecation or advance notice
-    return set(['identity.v2', 'identity.v3', 'object-storage', 'volume.v1',
-                'volume.v2', 'volume.v3'])
+    return set(['identity.v2', 'identity.v3', 'object-storage', 'volume.v3'])
 
 
 def available_modules():