Fix wrong links in Cinder

Some docs links have changed.
We should update the wrong links in our codes.

Change-Id: I5046be23703192ed6fad805355c8c50b9b4a71c8
diff --git a/cinder/tests/tempest/README.rst b/cinder/tests/tempest/README.rst
index 47ed98e..71248f4 100644
--- a/cinder/tests/tempest/README.rst
+++ b/cinder/tests/tempest/README.rst
@@ -5,7 +5,7 @@
 This directory contains additional Cinder tempest tests.
 
 See the tempest plugin docs for information on using it:
-http://docs.openstack.org/developer/tempest/plugin.html#using-plugins
+https://docs.openstack.org/tempest/latest/plugin.html#using-plugins
 
 To run all tests from this plugin, install cinder into your environment. Then
 from the tempest directory run::