Add link for Unset keys and update some links in qos_client

Change-Id: I3b6f26193c8c7da5c159efe9aa43ab76a51904dc
diff --git a/tempest/lib/services/volume/v2/qos_client.py b/tempest/lib/services/volume/v2/qos_client.py
index 5fac00f..40d4a3f 100644
--- a/tempest/lib/services/volume/v2/qos_client.py
+++ b/tempest/lib/services/volume/v2/qos_client.py
@@ -41,8 +41,11 @@
     def create_qos(self, **kwargs):
         """Create a QoS Specification.
 
-        Available params: see http://developer.openstack.org/
-                              api-ref-blockstorage-v2.html#createQoSSpec
+        For a full list of available parameters, please refer to the official
+        API reference:
+        http://developer.openstack.org/api-ref/block-storage/v2/index.html
+                                ?expanded=create-qos-specification-detail
+                                #quality-of-service-qos-specifications-qos-specs
         """
         post_body = json.dumps({'qos_specs': kwargs})
         resp, body = self.post('qos-specs', post_body)
@@ -76,8 +79,11 @@
     def set_qos_key(self, qos_id, **kwargs):
         """Set the specified keys/values of QoS specification.
 
-        Available params: see http://developer.openstack.org/
-                              api-ref-blockstorage-v2.html#setQoSKey
+        For a full list of available parameters, please refer to the official
+        API reference:
+        http://developer.openstack.org/api-ref/block-storage/v2/index.html
+                            ?expanded=set-keys-in-qos-specification-detail
+                            #quality-of-service-qos-specifications-qos-specs
         """
         put_body = json.dumps({"qos_specs": kwargs})
         resp, body = self.put('qos-specs/%s' % qos_id, put_body)
@@ -90,7 +96,11 @@
 
         :param keys: keys to delete from the QoS specification.
 
-        TODO(jordanP): Add a link once LP #1524877 is fixed.
+        For a full list of available parameters, please refer to the official
+        API reference:
+        http://developer.openstack.org/api-ref/block-storage/v2/index.html
+                            ?expanded=unset-keys-in-qos-specification-detail
+                            #quality-of-service-qos-specifications-qos-specs
         """
         put_body = json.dumps({'keys': keys})
         resp, body = self.put('qos-specs/%s/delete_keys' % qos_id, put_body)