Remove v3 onion secrets when transitioning to ssh over local

- v2 aths secret file pattern does not match the one for v3
- Use async task for reboot for more immediate feedback
- Instruct admin to run tailsconfig to update the ssh config on tails workstation

install_files/ansible-base/tasks/transistion_ssh_local.yml

@@ -6,6 +6,7 @@
           - "{{ playbook_dir }}"
         patterns:
           - '*ssh-aths'
+          - '*ssh.auth_private'
       register: find_ssh_aths_result
 
     - name: Delete any aths ssh files found
@@ -20,13 +21,15 @@
   run_once: yes
 
 - name: Force a reboot conditionally, when tor_over_ssh status changed
-  command: shutdown -r now
+  shell: sleep 2 && shutdown -r now
+  async: 1
+  poll: 0
   when: aths_deletion_results|changed
 
 - name: Provide helpful user message and end early
   fail:
     msg: |
       Due to the transition from ssh-over-tor to ssh-over-localnet
-      please re-run `./securedrop-admin install` again to continue
-      re-configuration.
+      please run `./securedrop-admin tailsconfig` and then re-run
+      `./securedrop-admin install` again to continue re-configuration.
   when: aths_deletion_results|changed