Fixes bug 902374-Negative tests for Volumes

Change-Id: Ic8f9f92f2f927f00c2eac0b6ba027ba4a45098bc
diff --git a/tempest/services/nova/json/volumes_client.py b/tempest/services/nova/json/volumes_client.py
new file mode 100644
index 0000000..95131f2
--- /dev/null
+++ b/tempest/services/nova/json/volumes_client.py
@@ -0,0 +1,36 @@
+from tempest.common import rest_client
+import json
+
+
+class VolumesClient(object):
+
+    def __init__(self, config, username, key, auth_url, tenant_name=None):
+        self.config = config
+        catalog_type = self.config.compute.catalog_type
+        self.client = rest_client.RestClient(config, username, key, auth_url,
+                                             catalog_type, tenant_name)
+
+    def list_volumes(self, params=None):
+        """List all the volumes created"""
+        url = 'os-volumes'
+        if params != None:
+            param_list = []
+            for param, value in params.iteritems():
+                param_list.append("%s=%s&" % (param, value))
+
+            url += '?' + ' '.join(param_list)
+
+        resp, body = self.client.get(url)
+        body = json.loads(body)
+        return resp, body['volumes']
+
+    def get_volume(self, volume_id):
+        """Returns the details of a single volume"""
+        url = "os-volumes/%s" % str(volume_id)
+        resp, body = self.client.get(url)
+        body = json.loads(body)
+        return resp, body['volume']
+
+    def delete_volume(self, volume_id):
+        """Deletes the Specified Volume"""
+        return self.client.delete("os-volumes/%s" % str(volume_id))