Update the old doc links

The links in CONTRIBUTING.rst and setup.cfg are old or invalid.
Update them to the right ones according to the OpenStack websites.

Change-Id: Ib46160c8057feafb15b42c64a1834fcbea124d37

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.
 

setup.cfg

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

setup.py

@@ -18,7 +18,7 @@ import setuptools
 
 # In python < 2.7.4, a lazy loading of package `pbr` will break
 # setuptools if some other modules registered functions in `atexit`.
-# solution from: http://bugs.python.org/issue15881#msg170215
+# solution from: https://bugs.python.org/issue15881#msg170215
 try:
     import multiprocessing  # noqa
 except ImportError: