a579e66 [backend] allow using raw ssh instead of paramiko

Authored and Committed by praiskup 7 years ago
    [backend] allow using raw ssh instead of paramiko
    
    This allows us to detect SSH connection issues more earlier
    instead of hanging forever.  Paramiko has issuees with keep-alive
    packets and timeouts:
    https://github.com/paramiko/paramiko/issues/918
    
    So now, reschedule build in case of SSH issues.  Also, heavily
    depend on openssh client configuration.
    
        
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