opener: forbid paths ending with directory separator (issue2507) If Linux is asked to open a filename with a trailing directory separator, e.g. "foo/", the open fails with EISDIR. On AIX, the open succeeds, opening file "foo". This causes test-mq-qnew to fail on AIX. Fix by adding 'ends with directory separator' to the conditions checked by the path auditor. Change test to expect auditor fail message.