Add functionality to prepare boxes for functional testing

Typically these actions were done manually but lets get our good old
friend ansible to run them for us (at least under the upgrade env).

molecule/upgrade/side_effect.yml

@@ -16,4 +16,21 @@
   roles:
     - role: app-test
       tags: app-test
+
+  tasks:
+    - name: Reset database
+      command: ./manage.py reset
+      args:
+        chdir: /var/www/securedrop
+
+    - name: Slap in latest create-dev-data script
+      copy:
+          src: ../../securedrop/create-dev-data.py
+          dest: /var/www/securedrop/create-dev-data.py
+          mode: 0555
+
+    - name: Insert journalist test user
+      command: /var/www/securedrop/create-dev-data.py --staging
+      args:
+        chdir: /var/www/securedrop
   become: yes