SSHJ disconnect exception

`[reader] INFO net.schmizz.sshj.transport.TransportImpl - Received SSH_MSG_DISCONNECT (reason=BY_APPLICATION, msg=User Disconnected)
[reader] ERROR net.schmizz.sshj.transport.TransportImpl - Dying because - User Disconnected
net.schmizz.sshj.transport.TransportException: [BY_APPLICATION] User Disconnected
at net.schmizz.sshj.transport.TransportImpl.gotDisconnect(TransportImpl.java:565)
at net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:521)
at net.schmizz.sshj.transport.Decoder.decode(Decoder.java:113)
at net.schmizz.sshj.transport.Decoder.received(Decoder.java:203)
at net.schmizz.sshj.transport.Reader.run(Reader.java:60)
[reader] INFO net.schmizz.sshj.transport.TransportImpl - Disconnected - BY_APPLICATION
[main] ERROR net.schmizz.concurrent.Promise - <> woke to: net.schmizz.sshj.connection.ConnectionException: User Disconnected
Caused by: net.schmizz.sshj.connection.ConnectionException: User Disconnected
at net.schmizz.sshj.connection.ConnectionException$1.chain(ConnectionException.java:32)
at net.schmizz.sshj.connection.ConnectionException$1.chain(ConnectionException.java:26)
at net.schmizz.concurrent.Promise.deliverError(Promise.java:95)
at net.schmizz.concurrent.Event.deliverError(Event.java:74)
at net.schmizz.concurrent.ErrorDeliveryUtil.alertEvents(ErrorDeliveryUtil.java:34)
at net.schmizz.sshj.connection.channel.AbstractChannel.notifyError(AbstractChannel.java:239)
at net.schmizz.sshj.connection.channel.direct.SessionChannel.notifyError(SessionChannel.java:229)
at net.schmizz.sshj.common.ErrorNotifiable$Util.alertAll(ErrorNotifiable.java:35)
at net.schmizz.sshj.connection.ConnectionImpl.notifyError(ConnectionImpl.java:261)
at net.schmizz.sshj.transport.TransportImpl.die(TransportImpl.java:620)
at net.schmizz.sshj.transport.Reader.run(Reader.java:66)
Caused by: net.schmizz.sshj.transport.TransportException: [BY_APPLICATION] User Disconnected
at net.schmizz.sshj.transport.TransportImpl.gotDisconnect(TransportImpl.java:565)
at net.schmizz.sshj.transport.TransportImpl.handle(TransportImpl.java:521)
at net.schmizz.sshj.transport.Decoder.decode(Decoder.java:113)
at net.schmizz.sshj.transport.Decoder.received(Decoder.java:203)
at net.schmizz.sshj.transport.Reader.run(Reader.java:60)`

MFT-14336/IT43709 - sshj SFTP client's sessions not getting clean disconnect after SSP upgrade
When the client is closing the sftp channel, SSP was closing everything
on its side . It was disconnecting the ssh connection before closing the
channel.
Resolution: Changed the order on SSP side to close the sftp channel and
then disconnect the ssh connection. Still this jssh sample client is
throwing stacktrace. Created a system property "sftp.channel.disconnect",
when set to false, will bypass this disconnect (the default value is true).
With this change the sshj client is terminates the connection correctly.