use --insecure for the SFTP and SCP tests

tests/data/test600

tests/data/test601

tests/data/test602

tests/data/test603

tests/data/test604

tests/data/test605

tests/data/test606

tests/data/test607

tests/data/test608

tests/data/test609

tests/data/test610

tests/data/test611

tests/data/test612

tests/data/test613

tests/data/test614

tests/data/test615

tests/data/test616

tests/data/test617

tests/data/test618

tests/data/test619