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.



git-svn-id: https://develop.svn.wordpress.org/trunk@25173 602fd350-edb4-49c9-b593-d223f7449a82