MDEV-18244 Server crashes in ha_innobase::update_thd / ... / ha_partition::update_next_auto_inc_val.

Partition table with the AUTO_INCREMENT column we ahve to check if the
max value is properly loaded. So we need to open all tables in INSERT
PARTITION statement if necessary. Also we need to check if some
tables are pruned away and not count the max autoincrement in this case.