Replace openstack.org git:// URLs with https://

This is a mechanically generated change to replace openstack.org
git:// URLs with https:// equivalents.

This is in aid of a planned future move of the git hosting
infrastructure to a self-hosted instance of gitea (https://gitea.io),
which does not support the git wire protocol at this stage.

This update should result in no functional change.

For more information see the thread at

 http://lists.openstack.org/pipermail/openstack-discuss/2019-March/003825.html

Change-Id: I5d16ebbd4e76a9df43e54984852d2267c3eefeb8

README.rst

@@ -39,7 +39,7 @@ Installation
 
 First of all, clone the repo and go to the repo directory::
 
-    $ git clone git://git.openstack.org/openstack/python-mistralclient.git
+    $ git clone https://git.openstack.org/openstack/python-mistralclient.git
     $ cd python-mistralclient
 
 Then just run::

playbooks/legacy/python-mistralclient-devstack-dsvm/run.yaml

@@ -17,7 +17,7 @@
               dest: devstack-gate
           EOF
           /usr/zuul-env/bin/zuul-cloner -m clonemap.yaml --cache-dir /opt/git \
-              git://git.openstack.org \
+              https://git.openstack.org \
               openstack-infra/devstack-gate
         executable: /bin/bash
         chdir: '{{ ansible_user_dir }}/workspace'
@@ -42,7 +42,7 @@
           export PROJECTS="openstack/mistral $PROJECTS"
           export PROJECTS="openstack/mistral-dashboard $PROJECTS"
           export DEVSTACK_LOCAL_CONFIG="enable_plugin mistral https://git.openstack.org/openstack/mistral"
-          export DEVSTACK_LOCAL_CONFIG+=$'\n'"enable_plugin heat git://git.openstack.org/openstack/heat"
+          export DEVSTACK_LOCAL_CONFIG+=$'\n'"enable_plugin heat https://git.openstack.org/openstack/heat"
 
           if [ "" == "-non-apache" ]; then
             export DEVSTACK_LOCAL_CONFIG+=$'\n'"MISTRAL_USE_MOD_WSGI=False"