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: I7d302c88ab93b19d46b5028e0b7b89563f80b3d1

CONTRIBUTING.rst

@@ -1,14 +1,14 @@
 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
 
 If you already have a good understanding of how the system works and your
 OpenStack accounts are set up, you can skip to the development workflow
 section of this documentation to learn how changes to OpenStack should be
 submitted for review via the Gerrit tool:
 
-   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

@@ -1,4 +1,4 @@
 vitrage Style Commandments
 ==========================
 
-Read the OpenStack Style Commandments http://docs.openstack.org/developer/hacking/
+Read the OpenStack Style Commandments https://docs.openstack.org/hacking/latest/

README.rst

@@ -24,5 +24,5 @@ Project Resources
 
 * Wiki page: https://wiki.openstack.org/wiki/Vitrage
 * Launchpad: https://launchpad.net/vitrage
-* Source: http://git.openstack.org/cgit/openstack/vitrage
+* Source: https://git.openstack.org/cgit/openstack/vitrage
 

vitrage/i18n.py

@@ -13,7 +13,7 @@
 # under the License.
 
 """oslo.i18n integration module.
-See http://docs.openstack.org/developer/oslo.i18n/usage.html
+See https://docs.openstack.org/oslo.i18n/latest/user/index.html
 """
 
 import oslo_i18n