Drop use of git.openstack.org

Our cgit instance will be going away and opendev.org is the new
preferred URL for browsing our git repos. Redirects will exist for the
foreseeable future, but it's more efficient to just go directly to the
new locations.

Change-Id: I4b7150e5116147c9be05fd9d698e7f3c747513a8
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>

README.rst

@@ -24,13 +24,13 @@ Getting Started
 
 If you'd like to run from the master branch, you can clone the git repo:
 
-    git clone https://git.openstack.org/openstack/cinder.git
+    git clone https://opendev.org/openstack/cinder
 
 For developer information please see
-`HACKING.rst <https://git.openstack.org/cgit/openstack/cinder/plain/HACKING.rst>`_
+`HACKING.rst <https://opendev.org/openstack/cinder/src/branch/master/HACKING.rst>`_
 
 You can raise bugs here https://bugs.launchpad.net/cinder
 
 Python client
 -------------
-https://git.openstack.org/cgit/openstack/python-cinderclient
+https://opendev.org/openstack/python-cinderclient

doc/source/configuration/block-storage/backup-drivers.rst

@@ -19,6 +19,6 @@ This section describes how to configure the cinder-backup service and
 its drivers.
 
 The volume drivers are included with the `Block Storage repository
-<https://git.openstack.org/cgit/openstack/cinder/>`_. To set a backup
+<https://opendev.org/openstack/cinder>`_. To set a backup
 driver, use the ``backup_driver`` flag. By default there is no backup
 driver enabled.

doc/source/configuration/block-storage/policy-config-HOWTO.rst

@@ -41,7 +41,7 @@ model Cinder employs and how it can be modfied by adjusting policies.
 * Instructions for generating a sample ``policy.yaml`` file directly from the
   Cinder source code can be found in the file ``README-policy.generate.md``
   in the ``etc/cinder`` directory in the Cinder `source code repository
-  <http://git.openstack.org/cgit/openstack/cinder>`_ (or its `github mirror
+  <https://opendev.org/openstack/cinder>`_ (or its `github mirror
   <https://github.com/openstack/cinder>`_).
 
 Vocabulary Note

doc/source/configuration/block-storage/volume-drivers.rst

@@ -6,7 +6,7 @@ To use different volume drivers for the cinder-volume service, use the
 parameters described in these sections.
 
 These volume drivers are included in the `Block Storage repository
-<https://git.openstack.org/cgit/openstack/cinder/>`_. To set a volume
+<https://opendev.org/openstack/cinder>`_. To set a volume
 driver, use the ``volume_driver`` flag.
 
 The default is:

doc/source/contributor/api_microversion_dev.rst

@@ -26,7 +26,7 @@ the ``_MIN_API_VERSION`` as defined in
 
 The Nova project was the first to implement microversions. For full
 details please read Nova's `Kilo spec for microversions
-<http://git.openstack.org/cgit/openstack/nova-specs/tree/specs/kilo/implemented/api-microversions.rst>`_
+<https://specs.openstack.org/openstack/nova-specs/specs/kilo/implemented/api-microversions.html>`_
 
 When do I need a new Microversion?
 ----------------------------------