fix #89 - use IllegalStateException from SSHClient when sanity-check assertions fail
fix #89 - use IllegalStateException from SSHClient when sanity-check assertions fail

bluekeyes/sshj,joprsal/sshj,hierynomus/sshj,Juraldinio/sshj,hierynomus/sshj,Boris-de/sshj,juddgaddie/sshj