Move wp-config-sample.php to the root of develop.svn.

wp-config.php is now created in the root. wp-config-sample.php is properly copied over to the build directory for syncing to core.svn.

Add some ignores.

fixes #25185, see #24976.


Built from https://develop.svn.wordpress.org/trunk@25173


git-svn-id: http://core.svn.wordpress.org/trunk@25147 1a063a9b-81f0-0310-95a4-ce76da25c4cd