Add migrator to 4.4.1
(cherry picked from commit b77d2b351e41767f72f5394bea7e04a0cdd5d30f)
Feature #2586: Optimize onedb upgrade
(cherry picked from commit 57099e26426ae63756f7c8cae91de7fe29ad1608)
Feature #2586: Optimize onedb fsck
(cherry picked from commit 492310768a15f90eb4428fcc43d3f190d53bd91f)