Added SFTP RSA Key to FTP Module
Removed option to send ssh key to _openConnection
Merge pull request #1567 from mattvot/feature/add-sftp-module-key-support

Add SSH key support to the (S)FTP module
In fact, only properties may be updated using Stub::update :(

This is so because method replaced only on stage of mock generation
Merge pull request #1578 from neoascetic/patch-2

In fact, only properties may be updated using Stub::update :(
Merge pull request #1 from Codeception/master

Master