Deprecate templated catalog driver

Keystone provided two in-tree catalog drivers, sql and templated.
However the templated driver hasn't been properly maintained.
The default template had not been updated for 8 years until it was
recently updated by [1].

This deprecates the driver assuming it's not widely used and sql driver
meets usual requirements.

This also restores the image service endpoints which were wrongly
removed by [1].

[1] c32bedb654

Related-Bug: #2013473
Change-Id: Iadb7bd5d7c4cf82aea2a7dbc1d8c4dbe53b9f763

etc/default_catalog.templates

@@ -16,6 +16,11 @@ catalog.RegionOne.volumev3.adminURL = http://localhost:8776/v3
 catalog.RegionOne.volumev3.internalURL = http://localhost:8776/v3
 catalog.RegionOne.volumev3.name = Volume Service V3
 
+catalog.RegionOne.image.publicURL = http://localhost:9292
+catalog.RegionOne.image.adminURL = http://localhost:9292
+catalog.RegionOne.image.internalURL = http://localhost:9292
+catalog.RegionOne.image.name = Image Service
+
 catalog.RegionOne.network.publicURL = http://localhost:9696
 catalog.RegionOne.network.adminURL = http://localhost:9696
 catalog.RegionOne.network.internalURL = http://localhost:9696

keystone/catalog/backends/templated.py

@@ -83,6 +83,8 @@ class Catalog(base.CatalogDriverBase):
 
     def __init__(self, templates=None):
         super(Catalog, self).__init__()
+        LOG.warning('The templated catalog driver has been deprecated and '
+                    'will be removed in a future release.')
         if templates:
             self.templates = templates
         else:

releasenotes/notes/deprecate-templated-catalog-driver-f811a6040abdc4a8.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    The templated catalog driver has been deprecated and will be removed in
+    a future release.