Fixed some test case after push of BUG#32205

mysql-test/r/binlog_start_comment.result:
  Drop tables used in the test case when done
mysql-test/r/blackhole.result:
  Mask out file_id in show binlog events output
mysql-test/r/case.result:
  Drop table t2 too if it exists at the start of the test
mysql-test/t/blackhole.test:
  Mask out file_id in show binlog events output
mysql-test/t/case.test:
  Drop table t2 too if it exists at the start of the test

mysql-test/r/binlog_start_comment.result

@@ -12,3 +12,4 @@ flush logs;
 select * from t2;
 word
 Ada
+drop table t1,t2;

mysql-test/r/blackhole.result

@@ -115,8 +115,8 @@ master-bin.000001	#	Query	1	#	use `test`; insert into t1 values(1)
 master-bin.000001	#	Query	1	#	use `test`; insert ignore into t1 values(1)
 master-bin.000001	#	Query	1	#	use `test`; replace into t1 values(100)
 master-bin.000001	#	Query	1	#	use `test`; create table t2 (a varchar(200)) engine=blackhole
-master-bin.000001	#	Begin_load_query	1	#	;file_id=1;block_len=581
-master-bin.000001	#	Execute_load_query	1	#	use `test`; load data infile '../std_data_ln/words.dat' into table t2 ;file_id=1
+master-bin.000001	#	Begin_load_query	1	#	;file_id=#;block_len=581
+master-bin.000001	#	Execute_load_query	1	#	use `test`; load data infile '../std_data_ln/words.dat' into table t2 ;file_id=#
 master-bin.000001	#	Query	1	#	use `test`; alter table t1 add b int
 master-bin.000001	#	Query	1	#	use `test`; alter table t1 drop b
 master-bin.000001	#	Query	1	#	use `test`; create table t3 like t1

mysql-test/r/case.result

-drop table if exists t1;
+drop table if exists t1, t2;
 select CASE "b" when "a" then 1 when "b" then 2 END;
 CASE "b" when "a" then 1 when "b" then 2 END
 2

mysql-test/t/blackhole.test

@@ -128,6 +128,7 @@ select * from t3;
 let $VERSION=`select version()`;
 --replace_result $VERSION VERSION
 --replace_column 2 # 5 #
+--replace_regex /file_id=[0-9]+/file_id=#/
 show binlog events;
 
 drop table t1,t2,t3;

mysql-test/t/case.test

@@ -3,7 +3,7 @@
 #
 
 --disable_warnings
-drop table if exists t1;
+drop table if exists t1, t2;
 --enable_warnings
 
 select CASE "b" when "a" then 1 when "b" then 2 END;