MDEV-8859 rpl.rpl_mdev382 sporadically fails to finish due to disappeared expect file

The combination of --remove_file and --write_file on .expect file creates
a race condition which can be hit by MTR which reads the file in a loop.
Instead, .expect file should be changed with --append_file.
It was fixed in 10.x, but in 5.5 the sporadic failure still affected buildbot.
Fixed 3 test files which use the problematic combination

mysql-test/suite/binlog/t/binlog_mdev342.test

@@ -44,8 +44,7 @@ connection con1;
 --error 2006,2013
 reap;
 
---remove_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
---write_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
+--append_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
 restart-binlog_mdev342.test
 EOF
 

mysql-test/suite/rpl/t/rpl_mdev382.test

@@ -209,8 +209,7 @@ EOF
 
 --shutdown_server 30
 
---remove_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
---write_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
+--append_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
 restart-rpl_mdev382.test
 EOF
 

mysql-test/suite/storage_engine/alter_tablespace.test

@@ -53,8 +53,7 @@ EOF
   --replace_result $datadir <DATADIR>
   --copy_file $datadir/test/t1.ibd $datadir/test/t1.ibd.save
 
-  --remove_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
-  --write_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
+  --append_file $MYSQLTEST_VARDIR/tmp/mysqld.1.expect
 restart
 EOF