Update the old doc links

Update the old url links in docs.

Change-Id: Iad72842a7a22c820c703a9270af8ce8ad2dd25ff
diff --git a/HACKING.rst b/HACKING.rst
index c01bb76..dc1f164 100644
--- a/HACKING.rst
+++ b/HACKING.rst
@@ -1,4 +1,4 @@
 barbican_tempest_plugin Style Commandments
 ===============================================
 
-Read the OpenStack Style Commandments http://docs.openstack.org/developer/hacking/
+Read the OpenStack Style Commandments https://docs.openstack.org/hacking/latest/