WordPress Core Automatic Updates: Switch to a twicedaily cronjob to match the update check cron jobs, this removes the ability for update checks to continuously re-queue a upgrade job. See #22704


git-svn-id: https://develop.svn.wordpress.org/trunk@25466 602fd350-edb4-49c9-b593-d223f7449a82
WordPress Core Automatic Updates: Switch from using a transient for locking the upgrade process, to using a site option. See #22704


git-svn-id: https://develop.svn.wordpress.org/trunk@25467 602fd350-edb4-49c9-b593-d223f7449a82