Update Rackspace vendor profile for cinder v2

Rackspace only has v1 in the catalog but run a cinder that supports
v2. Since SDK doesn't have support for v1 at all, update our
vendor config with an endpoint override for their block-storage
service.

As a special bit of hell, the url needs the project_id appended
which we cannot do with our normal format substitutions, so put in
YET ANOTHER Rackspace specific workaround logic.

Story: 2007459
Task: 39146
Change-Id: I4e6485b936b6b7303b6463cbacd3bf98746fc5e1

doc/source/user/config/vendor-support.rst

@@ -258,7 +258,10 @@ SYD            Sydney, NSW
 * Uploaded Images need properties to not use vendor agent::
   :vm_mode: hvm
   :xenapi_use_agent: False
-* Volume API Version is 1
+* Block Storage API Version is 2
+* The Block Storage API supports version 2 but only version 1 is in
+  the catalog. The Block Storage endpoint is
+  https://{region_name}.blockstorage.api.rackspacecloud.com/v2/{project_id}
 * While passwords are recommended for use, API keys do work as well.
   The `rackspaceauth` python package must be installed, and then the following
   can be added to clouds.yaml::

openstack/config/cloud_region.py

@@ -475,6 +475,18 @@ class CloudRegion(object):
             # Specifically, looking up a list of projects/domains/system to
             # scope to.
             value = auth.get('auth_url')
+        # Because of course. Seriously.
+        # We have to override the Rackspace block-storage endpoint because
+        # only v1 is in the catalog but the service actually does support
+        # v2. But the endpoint needs the project_id.
+        service_type = self._service_type_manager.get_service_type(
+            service_type)
+        if (
+            value
+            and self.config.get('profile') == 'rackspace'
+            and service_type == 'block-storage'
+        ):
+                value = value + auth.get('project_id')
         return value
 
     def get_endpoint_from_catalog(

openstack/config/vendors/rackspace.json

@@ -19,7 +19,8 @@
     "floating_ip_source": "None",
     "secgroup_source": "None",
     "requires_floating_ip": false,
-    "block_storage_api_version": "1",
+    "block_storage_endpoint_override": "https://{region_name}.blockstorage.api.rackspacecloud.com/v2/",
+    "block_storage_api_version": "2",
     "disable_vendor_agent": {
       "vm_mode": "hvm",
       "xenapi_use_agent": "False"

releasenotes/notes/rackspace-block-storage-v2-fe0dd69b9e037599.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Rackspace Cloud's vendor profile has been updated to use v2
+    of the Block Storage API. This introduces an endpoint override
+    for the service based on ``region_name`` and ``project_id``.