Setup: Allow for `wp-config-sample.php` to be formatted according to coding standards.

When the setup process reads `wp-config-sample.php`, it assumes that there are no spaces inside the brackes of the `define()`s. Unfortunately, this doesn't match our coding standards, so will no longer work correctly once we start enforcing them.

This also improves coding standards of the generated `wp-config.php` file.

See #41057.


Built from https://develop.svn.wordpress.org/trunk@42218


git-svn-id: http://core.svn.wordpress.org/trunk@42047 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/setup-config.php

@@ -332,7 +332,7 @@ switch($step) {
 			continue;
 		}
 
-		if ( ! preg_match( '/^define\(\'([A-Z_]+)\',([ ]+)/', $line, $match ) )
+		if ( ! preg_match( '/^define\(\s*\'([A-Z_]+)\',([ ]+)/', $line, $match ) )
 			continue;
 
 		$constant = $match[1];

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42217';
+$wp_version = '5.0-alpha-42218';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.