Revert "More verbosity"

This reverts commit 17735986.

test-driver

@@ -131,7 +131,7 @@ do_provision() {
 do_test() {
     for playbook in "${float_dir}/test/integration-test.yml" "$@"; do
         log Running test playbook ${playbook}
-        ${float_dir}/float run -e stdout_callback=default -v ${playbook} \
+        ${float_dir}/float run -v ${playbook} \
             || die "test playbook failed"
     done
 }