Update and replace http with https for doc links

1) Update doc links according to OpenStack document migration
2) Use https instead of http for docs links

Change-Id: I61252f53d3bb59d7357ef9a5898046e06fff553a

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.
 

README.rst

@@ -9,7 +9,7 @@ as one of the management protocols.
 :Free software: Apache license
 :Wiki: https://wiki.openstack.org/wiki/Valence
 :Source: http://git.openstack.org/cgit/openstack/valence
-:Bugs: http://bugs.launchpad.net/openstack-valence
+:Bugs: https://bugs.launchpad.net/openstack-valence
 
 
 =========================

valence/api/v1/version.py

@@ -73,7 +73,7 @@ class V1Base(base.ObjectBase):
         v1.links = [link.Link.make_link('self', request.url_root,
                                         'v1', '', bookmark=True),
                     link.Link.make_link('describedby',
-                                        'http://docs.openstack.org',
+                                        'https://docs.openstack.org',
                                         'developer/valence/dev',
                                         'api-spec-v1.html',
                                         bookmark=True, type='text/html')]