New function to set exec_log_entry
Moving code outside lock of table log
Fixing some initialisations of list reference to avoid
releasing wrong parts


sql/sql_partition.cc:
  New function to set exec_log_entry
  Moving code outside lock of table log
  Fixing some initialisations of list reference to avoid
  releasing wrong parts
sql/sql_table.cc:
  Initialisation of write_header needed