Comment 0 for bug 1667450

Since commit 41813736718e2b81d1d907bf49feb1940c1e990f the host-assisted migration is not deleting the source share in the backend anymore, only from database.

It is doing so because it is now invoking the incorrect helper function. Should be calling migration.ShareMigrationHelper.delete_instance_and_wait instead of _migration_delete_instance.