Update the documentation link for doc migration

1. Update URLs according to document migration
2. Optimize (e.g. http -> https)

Change-Id: I6a00171fe52e79e3bd8f9c2f73f8fafa3a35a077

CONTRIBUTING.rst

@@ -1,13 +1,13 @@
 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
 
 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

@@ -1,4 +1,4 @@
 python-congressclient 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

@@ -15,8 +15,8 @@ Client for Congress
 
 * Free software: Apache license
 * Documentation: https://docs.openstack.org/python-congressclient/latest/
-* Source: http://git.openstack.org/cgit/openstack/python-congressclient
-* Bugs: http://bugs.launchpad.net/python-congressclient
+* Source: https://git.openstack.org/cgit/openstack/python-congressclient
+* Bugs: https://bugs.launchpad.net/python-congressclient
 
 
 Client for Standalone Congress

congressclient/i18n.py

@@ -12,7 +12,7 @@
 
 """oslo_i18n integration module for novaclient.
 
-See http://docs.openstack.org/developer/oslo.i18n/usage.html .
+See https://docs.openstack.org/oslo.i18n/latest/user/usage.html.
 
 """