mysql-test/r/myisam.result:
  Test of DROP TABLE when .MYI or .MYD is missing
mysql-test/r/ndb_autodiscover.result:
  Update test results
mysql-test/r/rpl_EE_error.result:
  Change test to conform with new handling of drop table when handler file is missing
mysql-test/t/myisam.test:
  Test of DROP TABLE when .MYI or .MYD is missing
mysql-test/t/rpl_EE_error.test:
  Change test to conform with new handling of drop table when handler file is missing
sql/handler.cc:
  Generate a warning in ha_delete_table() if we get an error from 'delete_table()'
sql/handler.h:
  More parameters to ha_delete_table() so that we can generate better error messages
sql/sql_table.cc:
  Generate warning in ha_delete_table()