Allow tempest cleanup delete resources based on prefix

A warning in command description of run cleanup first with dry-run
is added. The cleanup behavior is extended to allow users to delete
only resources if their name starts with a certain prefix.

Closes-Bug: #1945082
Change-Id: I65dfe051c891b3679538acec713e8616746c47f6
diff --git a/roles/tempest-cleanup/tasks/main.yaml b/roles/tempest-cleanup/tasks/main.yaml
index c1d63f0..7ef4928 100644
--- a/roles/tempest-cleanup/tasks/main.yaml
+++ b/roles/tempest-cleanup/tasks/main.yaml
@@ -27,6 +27,15 @@
       command: tox -evenv-tempest -- tempest cleanup --debug
       args:
         chdir: "{{ devstack_base_dir }}/tempest"
+      when: not run_tempest_cleanup_prefix
+
+    - name: Run tempest cleanup with tempest prefix
+      become: yes
+      become_user: tempest
+      command: tox -evenv-tempest -- tempest cleanup --debug --prefix tempest
+      args:
+        chdir: "{{ devstack_base_dir }}/tempest"
+      when: run_tempest_cleanup_prefix
 
 - when:
     - run_tempest_fail_if_leaked_resources