Drop support for Block Storage API v2

... because it was already removed from cinder[1].

[1] e05b261af7dcd24096b229860df65dff1d385910

Change-Id: I8baf1701483ce2addd47dd4cb472f92ad4a192cd

heat/common/config.py

@@ -65,7 +65,7 @@ service_opts = [
     cfg.StrOpt('region_name_for_shared_services',
                help=_('Region name for shared services endpoints.')),
     cfg.ListOpt('shared_services_types',
-                default=['image', 'volume', 'volumev2', 'volumev3'],
+                default=['image', 'volume', 'volumev3'],
                 help=_('The shared services located in the other region.'
                        'Needs region_name_for_shared_services option to '
                        'be set for this to take effect.')),

heat/engine/clients/os/cinder.py

@@ -34,7 +34,7 @@ class CinderClientPlugin(os_client.ExtensionMixin,
 
     exceptions_module = exceptions
 
-    service_types = [VOLUME_V2, VOLUME_V3] = ['volumev2', 'volumev3']
+    service_types = [VOLUME_V3] = ['volumev3']
 
     def get_volume_api_version(self):
         '''Returns the most recent API version.'''
@@ -46,14 +46,7 @@ class CinderClientPlugin(os_client.ExtensionMixin,
             self.service_type = self.VOLUME_V3
             self.client_version = '3'
         except ks_exceptions.EndpointNotFound:
-            try:
-                self.context.keystone_session.get_endpoint(
-                    service_type=self.VOLUME_V2,
-                    interface=self.interface)
-                self.service_type = self.VOLUME_V2
-                self.client_version = '2'
-            except ks_exceptions.EndpointNotFound:
-                raise exception.Error(_('No volume service available.'))
+            raise exception.Error(_('No volume service available.'))
 
     def _create(self):
         self.get_volume_api_version()

releasenotes/notes/volumev2-removal-13eeb4d7192578ee.yaml

@@ -0,0 +1,4 @@
+---
+upgrade:
+  - |
+    Support for Block Storage API v2 has been removed.