Bug #21806: wrong ndb binlog behaviour when cluster disconnects/restarts

- latest gci is reinitialized to 0 at reconnect, ndb binlog thread needs to wait until valid gci is retrieved

mysql-test/r/ndb_binlog_discover.result

@@ -5,7 +5,7 @@ show binlog events from <binlog_start>;
 Log_name	Pos	Event_type	Server_id	End_log_pos	Info
 master-bin.000001	#	Query	#	#	BEGIN
 master-bin.000001	#	Table_map	#	#	table_id: # (test.t1)
-master-bin.000001	#	Table_map	#	#	table_id: # (mysql.apply_status)
+master-bin.000001	#	Table_map	#	#	table_id: # (mysql.ndb_apply_status)
 master-bin.000001	#	Write_rows	#	#	table_id: #
 master-bin.000001	#	Write_rows	#	#	table_id: # flags: STMT_END_F
 master-bin.000001	#	Query	#	#	COMMIT

mysql-test/t/disabled.def

@@ -32,8 +32,8 @@ synchronization          : Bug#24529  	Test 'synchronization' fails on Mac pushb
 
 # the below testcase have been reworked to avoid the bug, test contains comment, keep bug open
 #ndb_binlog_ddl_multi     : BUG#18976 2006-04-10 kent    CRBR: multiple binlog, second binlog may miss schema log events
-ndb_binlog_discover      : bug#21806 2006-08-24
-ndb_autodiscover3        : bug#21806
+#ndb_binlog_discover      : bug#21806 2006-08-24
+#ndb_autodiscover3        : bug#21806
 
 flush2                   : Bug#24805 Pushbuild can't handle test with --disable-log-bin
 

sql/ha_ndbcluster_binlog.cc

@@ -3542,7 +3542,7 @@ restart:
       if (abort_loop)
         goto err;
       schema_res= s_ndb->pollEvents(100, &schema_gci);
-    } while (ndb_latest_received_binlog_epoch == schema_gci);
+    } while (schema_gci == 0 || ndb_latest_received_binlog_epoch == schema_gci);
     if (ndb_binlog_running)
     {
       Uint64 gci= i_ndb->getLatestGCI();