Updates: Disable maintenance mode once we've finished copying files, to minimize disruption.

props dd32.
fixes #25655.


git-svn-id: https://develop.svn.wordpress.org/trunk@25866 602fd350-edb4-49c9-b593-d223f7449a82
Always apply the posts_search filter. Restores 3.6 behavior.

props SergeyBiryukov.
fixes #25664.


git-svn-id: https://develop.svn.wordpress.org/trunk@25867 602fd350-edb4-49c9-b593-d223f7449a82