Shouldn't throw an exception when receiving an unsupported SFTP message
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Key: SSHD-116
URL: https://issues.apache.org/jira/browse/SSHD-116
Project: MINA SSHD
Issue Type: Bug
Reporter: Nick Howes
Unsupported SFTP message types should just respond with SSH_FX_OP_UNSUPPORTED,
and not also throw an exception, since that ends the session. When I use
Ubuntu's Nautilus integration for SFTP that attempts READLINK requests quite a
lot, which are currently unimplemented in SftpSubsytem. If we stop throwing the
exception and just return the unsupported response, it works fine.
Attaching a patch.
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