Implement session-based login with OTP

[kamilkosek]

To be able to login with session based login with an OTP change your cloudsigma.conf to:

api_endpoint = https://<YOUR API>.cloudsigma.com/api/2.0/
ws_endpoint = wss://direct.<YOUR API>.cloudsigma.com/websocket
username = <USERNAME>
password = <PASSWORD>
secret = <TOTP SECRET>
login_method = session

where teh TOTP Secret comes from the WebUI during the MFA enrollment process.