Update the documentation link for doc migration

This patch is proposed according to the Direction 10 of doc
migration(https://etherpad.openstack.org/p/doc-migration-tracking).

Change-Id: I19d9f24df3f269586820ec7a735cb49d053dc460

CONTRIBUTING.rst

@@ -1,17 +1,17 @@
 If you would like to contribute to the development of OpenStack,
 you must follow the steps in this page:
 
-   http://docs.openstack.org/infra/manual/developers.html
+   https://docs.openstack.org/infra/manual/developers.html
 
 You can find more Sahara-specific info in our How To Participate guide:
 
-   http://docs.openstack.org/developer/sahara/devref/how_to_participate.html
+   https://docs.openstack.org/developer/sahara/devref/how_to_participate.html
 
 Once those steps have been completed, changes to OpenStack
 should be submitted for review via the Gerrit tool, following
 the workflow documented at:
 
-   http://docs.openstack.org/infra/manual/developers.html#development-workflow
+   https://docs.openstack.org/infra/manual/developers.html#development-workflow
 
 Pull requests submitted through GitHub will be ignored.
 

HACKING.rst

@@ -2,7 +2,7 @@ Sahara Style Commandments
 ==========================
 
 - Step 1: Read the OpenStack Style Commandments
-  http://docs.openstack.org/developer/hacking/
+  https://docs.openstack.org/hacking/latest/
 - Step 2: Read on
 
 Sahara Specific Commandments

setup.cfg

@@ -10,7 +10,7 @@ classifiers =
     Operating System :: POSIX :: Linux
 author = OpenStack
 author-email = openstack-dev@lists.openstack.org
-home-page = http://docs.openstack.org/developer/sahara
+home-page = https://docs.openstack.org/sahara/latest
 
 [files]
 scripts =