reduced log level for lenient handling of missing CR #647
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Currently, sshj logs a warning when a a server identifies itself with a string that is not terminated as expected with CR LF but only LF.
As a user of ssh, I may have no control over the server I am connecting to and can do nothing to remediate the underlying issue. At the same time, sshj handles this situation very gracefully. Therefore, I'd consider the log level warning as too high.
To ensure helpful logging of the library, I suggest to reduce the log level from warn to info.