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: I66b2e1aa6a175dee38284f0c0c133f9aee145ce3

.zuul.yaml

@@ -82,8 +82,8 @@
         TEMPEST_PLUGINS: /opt/stack/neutron-tempest-plugin
         NETWORK_API_EXTENSIONS: "{{ (network_api_extensions_common + network_api_extensions_tempest) | join(',') }}"
       devstack_plugins:
-        neutron: git://git.openstack.org/openstack/neutron.git
-        neutron-tempest-plugin: git://git.openstack.org/openstack/neutron-tempest-plugin.git
+        neutron: https://git.openstack.org/openstack/neutron.git
+        neutron-tempest-plugin: https://git.openstack.org/openstack/neutron-tempest-plugin.git
       devstack_services:
         tls-proxy: false
         tempest: true
@@ -418,8 +418,8 @@
         ADVANCED_INSTANCE_USER: ubuntu
         BUILD_TIMEOUT: 784
       devstack_plugins:
-        neutron: git://git.openstack.org/openstack/neutron.git
-        neutron-tempest-plugin: git://git.openstack.org/openstack/neutron-tempest-plugin.git
+        neutron: https://git.openstack.org/openstack/neutron.git
+        neutron-tempest-plugin: https://git.openstack.org/openstack/neutron-tempest-plugin.git
       devstack_services:
         tls-proxy: false
         tempest: true
@@ -552,7 +552,7 @@
         # empty
         ADVANCED_IMAGE_NAME: ""
       devstack_plugins:
-        designate: git://git.openstack.org/openstack/designate.git
+        designate: https://git.openstack.org/openstack/designate.git
       devstack_services:
         cinder: false
         designate: true