Use console_loadkeys_us rather than manual load.

Also add the Czech environment to that function and
deduplicate wait_still_screen by moving it out of the
conditions.

lib/utils.pm

@@ -369,12 +369,14 @@ sub console_loadkeys_us {
     if (get_var('LANGUAGE') eq 'french') {
         script_run "loqdkeys us", 0;
         # might take a few secs
-        wait_still_screen 3;
     }
     elsif (get_var('LANGUAGE') eq 'japanese' || get_var('LANGUAGE') eq 'turkish') {
         script_run "loadkeys us", 0;
-        wait_still_screen 3;
     }
+    elsif (get_var('LANGUAGE') eq 'czech' || get_var('LAYOUT' eq 'czech')) {
+        script_run('loadkezs us', 0);
+    }
+    wait_still_screen(3);
 }
 
 sub do_bootloader {

templates.fif.json

@@ -1176,6 +1176,7 @@
             "settings": {
                 "BOOTFROM": "c",
                 "HDD_1": "disk_%FLAVOR%_%MACHINE%.qcow2",
+                "LAYOUT": "czech",
                 "POSTINSTALL_PATH": "tests/applications/gnome-initial-setup",
                 "START_AFTER_TEST": "%DEPLOY_UPLOAD_TEST%"
             }

tests/applications/gnome-initial-setup/post_scriptum.pm

@@ -50,8 +50,7 @@ sub run {
     # run commands correctly. Note, that the loadkeys command must
     # be presented in the foreign layout.
     $self->root_console(tty => 3);
-    enter_cmd('loadkezs us');
-    wait_still_screen(2);
+    console_loadkeys_us();
     assert_script_run("chmod 666 /dev/${serialdev}");
 
     # Check that system locale are set to Czech (cs_CZ.UTF-8)