Bug #20843 tests fails randomly with assertion in completeClusterFailed

- reenabled test as this now seems fixed

mysql-test/t/disabled.def

@@ -18,10 +18,6 @@
 #im_life_cycle             : Bug#20368 2006-06-10 alik    im_life_cycle test fails
 ndb_autodiscover         : BUG#18952 2006-02-16 jmiller Needs to be fixed w.r.t binlog
 ndb_autodiscover2        : BUG#18952 2006-02-16 jmiller Needs to be fixed w.r.t binlog
-ndb_autodiscover3        : BUD#20843 2006-07-04 tomas ndb_autodiscover3 fails randomly
-#ndb_binlog_discover      : BUG#19395 2006-04-28 tomas/knielsen mysqld does not always detect cluster shutdown
-#ndb_cache2               : BUG#18597 2006-03-28 brian simultaneous drop table and ndb statistics update triggers node failure
-#ndb_cache_multi2         : BUG#18597 2006-04-10 kent  simultaneous drop table and ndb statistics update triggers node failure
 ndb_load                 : BUG#17233 2006-05-04 tomas failed load data from infile causes mysqld dbug_assert, binlog not flushed
 partition_03ndb          : BUG#16385 2006-03-24 mikael Partitions: crash when updating a range partitioned NDB table
 ps_7ndb                  : BUG#18950 2006-02-16 jmiller create table like does not obtain LOCK_open