- removed some returns on ndb internal error codes, return ndb cause in warnings
- moved all errorcode mapping mysqld-ndb to ndberror.c
- ndb util thread to discover all ndb tables at startup
- ndb util thread to wait for mysqld startup
1) fix so that missing blob tables don't prevent table from being
dropped
2) decrease size of blob part if record length exceeds max length
3) add test case for table wo/ corresponding blob table
4) init scan counters when sending scan_tabreq