Update the documentation link for doc migration

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

Change-Id: Ie697ccde0041f1557711bf921bfc38cad6f4d2d9

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 @@
 networking-l2gw 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

@@ -5,7 +5,7 @@ networking-l2gw
 API's and implementations to support L2 Gateways in Neutron.
 
 * Free software: Apache license
-* Source: http://git.openstack.org/cgit/openstack/networking-l2gw
+* Source: https://git.openstack.org/cgit/openstack/networking-l2gw
 
 L2 Gateways
 -----------

setup.cfg

@@ -5,7 +5,7 @@ description-file =
     README.rst
 author = OpenStack
 author-email = openstack-dev@lists.openstack.org
-home-page = http://docs.openstack.org/developer/networking-l2gw
+home-page = https://git.openstack.org/cgit/openstack/networking-l2gw
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology