Disable admin panel for the subscribers and add wp-login.php to custom login page

functions.php

<?php 

add_filter( 'show_admin_bar' , 'bd_disable_admin_bar');
function bd_disable_admin_bar($show_admin_bar) {
	return ( current_user_can( 'administrator' ) ) ? $show_admin_bar : false;
}

add_action('init','redirect_to_login_page');
function redirect_to_login_page(){
	global $pagenow;
	if( 'wp-login.php' == $pagenow ) {
		wp_redirect('http://site.com/login/');
		exit();
	}
}