Ensure that send_key doesn't run on virtio console

Call show_tasks_in_blocked_state after selecting
non-virtio console if needed.

lib/console_yasttest.pm

@@ -9,11 +9,21 @@ use utils 'show_tasks_in_blocked_state';
 sub post_fail_hook {
     my $self = shift;
 
-    show_tasks_in_blocked_state;
+    my $defer_blocked_task_info = 0;
+    if (testapi::is_serial_terminal()) {
+        $defer_blocked_task_info = 1;
+    }
+    else {
+        show_tasks_in_blocked_state;
+    }
 
     select_console 'log-console';
     save_screenshot;
 
+    if ($defer_blocked_task_info) {
+        show_tasks_in_blocked_state;
+    }
+
     upload_logs('/var/log/zypper.log');
     $self->remount_tmp_if_ro;
     $self->save_upload_y2logs;