test: use systemd.status-unit-format=name in all but one test

We want to test the traditional output, but the non-default one is generally
much nicer for debugging (and takes less space...).

test/test-functions

@@ -919,6 +919,12 @@ install_config_files() {
 
     # set the hostname
     echo systemd-testsuite > $initdir/etc/hostname
+
+    # let's set up just one image with the traditional verbose output
+    if [ ${IMAGE_NAME} != "basic" ]; then
+        mkdir -p $initdir/etc/systemd/system.conf.d
+        echo -e '[Manager]\nStatusUnitFormat=name' >$initdir/etc/systemd/system.conf.d/status.conf
+    fi
 }
 
 install_basic_tools() {