Add a sleep to server_cockpit_autoupdate to work around #1765685

We don't know exactly what's going on with this bug yet, but as
a 15 second sleep seems to avoid the issue, let's do that for
now so we catch any future issues.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

tests/server_cockpit_autoupdate.pm

@@ -15,6 +15,9 @@ sub run {
     # Navigate to the Update screen
     select_cockpit_update();
 
+    # FIXME Workaround for RHBZ #1765685 - remove when it's fixed
+    sleep 15;
+
     # Switch on automatic updates
     assert_and_click 'cockpit_updates_auto', '', 120;
     assert_and_click 'cockpit_updates_dnf_install', '', 120;