Remove deprecated object storage client interfaces

These were deprecated during Queens cycle. Codesearch shows no usage
of these.

Change-Id: Iad5baa11aff0f4ecccd0852f50d29537a809b446
diff --git a/releasenotes/notes/cleanup-container-client-interface-6a9fe49072cfdb17.yaml b/releasenotes/notes/cleanup-container-client-interface-6a9fe49072cfdb17.yaml
new file mode 100644
index 0000000..48c1717
--- /dev/null
+++ b/releasenotes/notes/cleanup-container-client-interface-6a9fe49072cfdb17.yaml
@@ -0,0 +1,8 @@
+---
+upgrade:
+  - |
+    The following deprecated alias methods of the ``ContainerClient`` class
+    has been removed.
+
+    - ``update_container_metadata``, replaced by ``create_update_or_delete_container_metadata``
+    - ``list_container_contents``, replaced by ``list_container_objects``
diff --git a/tempest/lib/services/object_storage/container_client.py b/tempest/lib/services/object_storage/container_client.py
index bdca0d0..ee3cc9a 100644
--- a/tempest/lib/services/object_storage/container_client.py
+++ b/tempest/lib/services/object_storage/container_client.py
@@ -15,7 +15,6 @@
 
 from urllib import parse as urllib
 
-import debtcollector.moves
 from defusedxml import ElementTree as etree
 from oslo_serialization import jsonutils as json
 
@@ -85,11 +84,6 @@
         self.expected_success(204, resp.status)
         return resp, body
 
-    update_container_metadata = debtcollector.moves.moved_function(
-        create_update_or_delete_container_metadata,
-        'update_container_metadata', __name__,
-        version='Queens', removal_version='Rocky')
-
     def list_container_metadata(self, container_name):
         """List all container metadata."""
         url = str(container_name)
@@ -126,7 +120,3 @@
 
         self.expected_success([200, 204], resp.status)
         return resp, body
-
-    list_container_contents = debtcollector.moves.moved_function(
-        list_container_objects, 'list_container_contents', __name__,
-        version='Queens', removal_version='Rocky')