Optimize the link address

Use https instead of http

Change-Id: I699e763b2bb97bbc88e510f69709673333d1ce8c

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

@@ -2,7 +2,7 @@ Tacker Style Commandments
 =========================
 
 - Step 1: Read the OpenStack Style Commandments
-  http://docs.openstack.org/developer/hacking/
+  https://docs.openstack.org/developer/hacking/
 - Step 2: Read on
 
 Tacker Specific Commandments

README.rst

@@ -2,8 +2,8 @@
 Team and repository tags
 ========================
 
-.. image:: http://governance.openstack.org/badges/tacker.svg
-    :target: http://governance.openstack.org/reference/tags/index.html
+.. image:: https://governance.openstack.org/badges/tacker.svg
+    :target: https://governance.openstack.org/reference/tags/index.html
 
 .. Change things from this point on
 
@@ -30,9 +30,9 @@ Code:
 
 Tacker code is available in following repositories:
 
-* **Tacker server:** http://git.openstack.org/cgit/openstack/tacker
-* **Tacker Python client:** http://git.openstack.org/cgit/openstack/python-tackerclient
-* **Tacker Horizon UI:** http://git.openstack.org/cgit/openstack/tacker-horizon
+* **Tacker server:** https://git.openstack.org/cgit/openstack/tacker
+* **Tacker Python client:** https://git.openstack.org/cgit/openstack/python-tackerclient
+* **Tacker Horizon UI:** https://git.openstack.org/cgit/openstack/tacker-horizon
 
 Bugs:
 =====