Update the documentation link for doc migration

Change-Id: Icbb63027ce6530372475b9392eb373c8678ae0fb
BTW: Do some optimization as well (http -> https)

CONTRIBUTING.rst

@@ -87,5 +87,5 @@ Bugs should be filed on Launchpad:
 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
 

HACKING.rst

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

setup.cfg

@@ -5,7 +5,7 @@ description-file =
     README.md
 author = OpenStack
 author-email = openstack-dev@lists.openstack.org
-home-page = http://www.openstack.org/
+home-page = https://www.openstack.org/
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology

specs/todo.txt

@@ -1,6 +1,6 @@
 nova-lxd todo list
 
-Taken from http://docs.openstack.org/developer/nova/support-matrix.html
+Taken from https://docs.openstack.org/nova/latest/support-matrix.html
 
 Feature         Status      Kilo            Liberty
 Attach block    optional     X              not started