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: Ib2c5e4d6db9875a459dc868bac161e4c534d52d7

charmhelpers/contrib/openstack/utils.py

@@ -679,10 +679,10 @@ def git_clone_and_install(projects_yaml, core_project):
 
         repositories:
           - {name: keystone,
-             repository: 'git://git.openstack.org/openstack/keystone.git',
+             repository: 'https://git.openstack.org/openstack/keystone.git',
              branch: 'stable/icehouse'}
           - {name: requirements,
-             repository: 'git://git.openstack.org/openstack/requirements.git',
+             repository: 'https://git.openstack.org/openstack/requirements.git',
              branch: 'stable/icehouse'}
 
         directory: /mnt/openstack-git