Remove old v3 volume services library and use lib/service for v3

Moving volume v3 folders to /lib/services/volumes
Remove old left overs from service/volumes.

The patch removes services/volume api code
Tempest volume api will run from /lib/service

Change-Id: I76fec9c42ecb7038f01a186f3eb51bb471b1679d
diff --git a/tempest/lib/services/clients.py b/tempest/lib/services/clients.py
index 9e58872..0e8e3c6 100644
--- a/tempest/lib/services/clients.py
+++ b/tempest/lib/services/clients.py
@@ -45,7 +45,8 @@
         'image.v2': image.v2,
         'network': network,
         'volume.v1': volume.v1,
-        'volume.v2': volume.v2
+        'volume.v2': volume.v2,
+        'volume.v3': volume.v3
     }
 
 
@@ -54,7 +55,7 @@
     # 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.v3', 'object-storage', 'volume.v3'])
+    return set(['identity.v3', 'object-storage'])
 
 
 def available_modules():