Always convert auto-drafts to drafts in edit_draft() and _wp_translate_postdata().

This regressed due to refactoring in [26995]. This commit fixes Quick Draft.

see #25272.


git-svn-id: https://develop.svn.wordpress.org/trunk@27405 602fd350-edb4-49c9-b593-d223f7449a82
Multisite load: Properly call wp_cache_set().

props gradyetc.
see #27003.


git-svn-id: https://develop.svn.wordpress.org/trunk@27406 602fd350-edb4-49c9-b593-d223f7449a82