Add some output to the `find' command

This, alongside the "df -h" output, may provide some useful information
about the /opt content (not as precise as a `du -shxc /opt', but at
least it's already something). It can then be compared with the
existing `df -h' information located in the zuul-info/ directory. 

The goal here is to understand the actual impact of this task.

Change-Id: I201eba6ec6db9f0caaaabb0a3d15b0894125c7d6

roles/configure-swap/tasks/ephemeral.yaml

@@ -107,13 +107,19 @@
 # [1] https://github.com/ansible/ansible/pull/27174
 - name: Copy old /opt
   become: yes
+  register: moving_opt
   shell: |
     mount {{ opt_partition }} /mnt
-    find /opt/ -mindepth 1 -maxdepth 1 -exec mv {} /mnt/ \;
+    find /opt/ -mindepth 1 -maxdepth 1 -print -exec mv {} /mnt/ \;
     umount /mnt
+    df -h
   tags:
     - skip_ansible_lint
 
+- name: Output data from old /opt
+  debug:
+    var: moving_opt
+
 # This overmounts any existing /opt
 - name: Add opt to fstab and mount
   become: yes