Fixed crashing bug when doing ALTER TABLE RENAME with transactional tables.

client/mysqltest.cc:
  Added errno to error message for system calls (delete, rename etc)
  Write error message for failures of system calls
mysql-test/include/cleanup_fake_relay_log.inc:
  Disable warnings for remove_file
mysql-test/include/diff_tables.inc:
  Disable warnings for remove_file
mysql-test/include/maria_empty_logs.inc:
  Disable warnings for remove_file
mysql-test/include/maria_make_snapshot.inc:
  Disable warnings for remove_file
mysql-test/include/maria_make_snapshot_for_feeding_recovery.inc:
  Disable warnings for remove_file
mysql-test/include/mysqlhotcopy.inc:
  Disable warnings for remove_file
mysql-test/include/ndb_backup.inc:
  Disable warnings for remove_file
mysql-test/include/ndb_backup_print.inc:
  Disable warnings for remove_file
mysql-test/r/alter_table_trans.result:
  Test of crashing ALTER TABLE RENAME bug
mysql-test/t/alter_table_trans.test:
  Test of crashing ALTER TABLE RENAME bug
mysql-test/t/mysqltest.test:
  Disable warnings for remove_file and move_file
mysys/my_copy.c:
  Fixed wrong error message
sql/sql_table.cc:
  Fixed crashing bug when doing ALTER TABLE RENAME with transactional tables.