Fix javadocs errors reported on JDK 8 which cause build to fail
[SSHD-371] Support Socks proxy with ssh tunnelling on the client side
[SSHD-366] Need to cross reference provided host keys with configured signature factories
[SSHD-368] Add a timeout on the client to better handle the ssh server being slow to respond or some packets being lost
Display the nlink attribute correctly in sftp long file names
[sftp] Fix exceptions while listing directories with broken links