No output from save-logs

test-driver

@@ -51,8 +51,10 @@ wait_for_vms() {
 save_logs() {
     local out_dir="$1"
 
+    # Try to keep ansible-playbook output to a minimum so as not to
+    # take too much space in the CI job logs.
     mkdir -p "${out_dir}"
-    ANSIBLE_STDOUT_CALLBACK=actionable \
+    ANSIBLE_STDOUT_CALLBACK=null \
     ${float_dir}/float run --extra-vars "out_dir=${out_dir}" \
         ${float_dir}/test/save-logs.yml
 }