Fix nginx_config_dir value not defined when use reset.yml (#3524)

roles/kubespray-defaults/defaults/main.yaml

@@ -25,6 +25,9 @@ kube_proxy_nodeport_addresses: false
 # Set to true to allow pre-checks to fail and continue deployment
 ignore_assert_errors: false
 
+# nginx-proxy configure
+nginx_config_dir: "/etc/nginx"
+
 # Directory where the binaries will be installed
 bin_dir: /usr/local/bin
 docker_bin_dir: /usr/bin