LP:697174 - mysqldump --single-transaction in maria-5.1-mwl136 uses an absolute path to master_log_file in CHANGE MASTER

When using mysqldump --single-transaction --master data, the following CHANGE MASTER is produced:

CHANGE MASTER TO MASTER_LOG_FILE='/home/philips/bzr/maria-5.1-mwl136/mysql-test/var/log/master-bin.000001', MASTER_LOG_POS=1255946;

Using absolute paths for MASTER_LOG_FILE will cause the slave to stop with a "cannot open first file" error. By contrast, normal mysqldump would return:

CHANGE MASTER TO MASTER_LOG_FILE='master-bin.000001', MASTER_LOG_POS=1255946;

To reproduce:

1. default mysqldump from RPM
   mysqldump --single-transaction --master-data -uroot --protocol=tcp --port=19300 test | grep -i change
   CHANGE MASTER TO MASTER_LOG_FILE='master-bin.000001', MASTER_LOG_POS=1255946;

1. mysqldump from wl139
   ../client/mysqldump --single-transaction --master-data -uroot --protocol=tcp --port=19300 test | grep -i change
   CHANGE MASTER TO MASTER_LOG_FILE='/home/philips/bzr/maria-5.1-mwl136/mysql-test/var/log/master-bin.000001', MASTER_LOG_POS=1255946;

../client/mysqldump --master-data -uroot --protocol=tcp --port=19300 test | grep -i change
CHANGE MASTER TO MASTER_LOG_FILE='master-bin.000001', MASTER_LOG_POS=1255946;