tests: test more reliably if port 25 is reachable #580
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Follow-up for #552
The test failed with this error:
Port 25 is blocked on my network, it's not hard to see why it failed.
cmdeploy/src/cmdeploy/tests/online/test_0_login.py::test_no_vrfy
was skipped correctly in the samecmdeploy test
run, so I took that method of testing whether port 25 is available, seems more reliable.