mysql-test/include/maria_empty_logs.inc:
  can now ask that control file be preserved
mysql-test/lib/mtr_report.pl:
  expected warning (produced by translog_init() when log is missing)
mysql-test/r/maria-recovery.result:
  result update
mysql-test/t/maria-recovery.test:
  test of removing logs manually; recovery used to fail
storage/maria/ma_loghandler.c:
  The addition to maria-recovery.test uncovered a bug: log 1 was
  manually deleted, Maria restarted, created log 2, then crash
  before a checkpoint: logs_found is TRUE, last_checkpoint_lsn
  is LSN_IMPOSSIBLE, so sure_page assumes that log 1 exists;
  using last_logno instead (only the last log needs to be checked,
  as the 'else' branch checks only after last_checkpoint_lsn:
  creation of a log is as good a starting point as a checkpoint,
  for scanning the log).