added checking for bootstrap in select_send::send_data

(fixed bug #2526 "--init-file crashes MySQL if contains large select")
Such checking usually works in send_ok, send_eof, but in this case large 
result causes interim flushing.

mysql-test/t/init_file-master.opt

+--init-file=$MYSQL_TEST_DIR/t/init_file.sql
\ No newline at end of file

mysql-test/t/init_file.sql

+select * from mysql.user as t1, mysql.user as t2, mysql.user as t3, mysql.user as t4, mysql.user as t5, mysql.user as t6, mysql.user as t7, mysql.user as t8;
\ No newline at end of file

mysql-test/t/init_file.test

+#
+# This test is first part of test init_file_part2.test (bug #2526)
+# 
+
+#DROP TABLE IF EXISTS t1;
+
+#CREATE TABLE t1 
+#(
+#  i int(11) default NULL
+#) TYPE=MyISAM;
+  
+#INSERT INTO t1 VALUES (1),(2),(3),(4),(5),(6),(7),(8),(9),(10);
\ No newline at end of file

sql/sql_class.cc

@@ -495,6 +495,8 @@ bool select_send::send_data(List<Item> &items)
     }
   }
   thd->sent_row_count++;
+  if (thd->bootstrap)
+    DBUG_RETURN(0);
   bool error=my_net_write(&thd->net,(char*) packet->ptr(),packet->length());
   DBUG_RETURN(error);
 }