This commit removes code to support upgrade from <v1.6.0
It also removes packages for supporting mysql/mariadb from Dockerfile
It does not handle the optimization in the script such as run.sh after the update.
Signed-off-by: Daniel Jiang <jiangd@vmware.com>
This commit is to enable data migrator to support migrates data
from mysql to pgsql, this is a specific step for user to upgrade
harbor across v1.5.0, as we have move harbor DB to pgsql from
1.5.0. It supports both harbor and notary db data migration,
and be split into two steps with dependency.
It also fix issue #4847, add build DB migrator in make process.
