This is the second part of migrating the starred changes from database
to git.
This change:
* bumps the database schema version
* migrates the starred changes from database to git (for single
instance Gerrit servers)
* deletes the database table
* deletes the user.readStarredChangesFromGit config option
Change-Id: I534e98dc60050c5e409765c96def359503529035
Signed-off-by: Edwin Kempin <ekempin@google.com>
dde2447c6d