Arthur/ssh check

Check meant to:
1. Check the status of SFTP
2.Check The response time 


@LeoCavaille 
I don't see why we would want to stop the execution, shouldn't that only occur on something critical that would prevent the check from occurring?  We have feedback in the exception message to allow the user know if they did something wrong like a wrong password.   

The sftp_check does will still do the service check if this situation occurs