Make sure the migrations table schema is always checked

Signed-off-by: Julius Härtl <jus@bitgrid.net>

Revert "Make sure the migrations table schema is always checked"

This reverts commit 258955ef738a52d9da2ac2fe59466e6093d7e9bc.

Set current vendor during upgrade and perform migrations table change if needed

Signed-off-by: Julius Härtl <jus@bitgrid.net>