Wait when stopping supervisor

Fixes a problem where we issue a start before supervisor has cleaned up
child pids (Ubuntu only).

Trello: https://trello.com/c/5rOxYcY5

tools/scripts/ansible-tower

@@ -30,6 +30,11 @@ service_action() {
         if [ $this_return -gt $worst_return ]; then
             worst_return=$this_return
         fi
+        # Allow supervisor time to cleanup child pids (ubuntu only)
+        if [[ ${svc} == supervisor* && ${1} == stop && -e /etc/debian_version ]]; then
+            echo "Waiting to allow supervisor time to cleanup ..."
+            sleep 5
+        fi
     done
 }