Sftp notes

Dependencies
sftp client:
org="com.jcraft" name="jsch" rev="0.1.53"
sftp server:
org="org.apache.sshd" name="sshd-core" rev="0.14.0"
org="org.apache.sshd" name="sshd-sftp" rev="0.11.0"


Ref:
http://www.jcraft.com/jsch/
https://mina.apache.org/sshd-project/
https://dzone.com/articles/spring-integration-mock-0
https://stackoverflow.com/questions/11837948/using-apache-mina-as-a-mock-in-memory-sftp-server-for-unit-testing