fix binlog-writing so that end_log_pos is given correctly even
within transactions for both SHOW BINLOG and SHOW MASTER STATUS,
that is as absolute values (from log start) rather than relative
values (from transaction's start).
---
Merge tnurnberg@bk-internal.mysql.com:/home/bk/mysql-5.0-maint
into  sin.intern.azundris.com:/home/tnurnberg/22540/50-22540


mysql-test/r/binlog.result:
  Bug #22540: Incorrect value in column End_log_pos of SHOW BINLOG EVENTS using InnoDB
  
  show that end_log_pos in SHOW BINLOG EVENTS is correct even in transactions.
  show that SHOW MASTER STATUS returns correct values while in transactions
  (so that mysqldump --master-data will work correctly).
  also remove bdb dependency.
  ---
  manual merge
mysql-test/t/binlog.test:
  Bug #22540: Incorrect value in column End_log_pos of SHOW BINLOG EVENTS using InnoDB
  
  show that end_log_pos in SHOW BINLOG EVENTS is correct even in transactions.
  show that SHOW MASTER STATUS returns correct values while in transactions
  (so that mysqldump --master-data will work correctly).
  also remove bdb dependency.
sql/log.cc:
  Bug #22540: Incorrect value in column End_log_pos of SHOW BINLOG EVENTS using InnoDB
  
  fix output for SHOW BINLOG EVENTS so that end_log_pos is given correctly
  even within transactions. do this by rewriting the commit-buffer in place.