Added 'from_end' as extra parameter to Field::unpack() to detect wrong from data.
Change ha_archive::unpack_row() to detect wrong field lengths.
Replication code changed to detect wrong field information in events.


mysql-test/r/archive.result:
  dded test case for lp:917689
sql/field.cc:
  Added 'from_end' as extra parameter to Field::unpack() to detect wrong from data.
  Removed not used 'unpack_key' functions.
sql/field.h:
  Added 'from_end' as extra parameter to Field::unpack() to detect wrong from data.
  Removed not used 'unpack_key' functions.
  Removed some not needed unpack() functions.
sql/filesort.cc:
  Added buffer end parameter to unpack_addon_fields()
sql/log_event.h:
  Added end of buffer argument to unpack_row()
sql/log_event_old.cc:
  Added end of buffer argument to unpack_row()
sql/log_event_old.h:
  Added end of buffer argument to unpack_row()
sql/records.cc:
  Added buffer end parameter to unpack_addon_fields()
sql/rpl_record.cc:
  Added end of buffer argument to unpack_row()
  Added detection of wrong field information in events
sql/rpl_record.h:
  Added end of buffer argument to unpack_row()
sql/rpl_record_old.cc:
  Added end of buffer argument to unpack_row()
  Added detection of wrong field information in events
sql/rpl_record_old.h:
  Added end of buffer argument to unpack_row()
sql/table.h:
  Added buffer end parameter to unpack()
storage/archive/ha_archive.cc:
  Change ha_archive::unpack_row() to detect wrong field lengths.
  This fixes lp:917689