for ALTER_PARTITION_ADMIN (CHECK/REPAIR/LOAD INDEX/CACHE INDEX/etc)
partitioning marks affected partitions with PART_ADMIN state.

The assumption is that the server will call a corresponding
method of ha_partition which will reset the state back to PART_NORMAL.

This assumption is invalid, the server is not required to do so,
indeed, in CHECK ... FOR UPGRADE the server might decide early that
the table is fine and won't call ha_partition::check(), leaving
partitions in the wrong state. It will thus leak into the next
statement confusing the engine about what it is doing (see
ha_partition::create_handler_file()), causing a crash later.

Let's force all partitions into PART_NORMAL state after the admin
operation succeeded, in case it did so without consulting the engine.