add option to clear credentials before connect

[Jokatek]

I currently have the problem that the credentials have to be reset with every connection, otherwise the two-factor identification with duo mobile is not activated. For me it would therefore make sense if there was an option to do this automatically.

What surprises me is that the connection is not established, but the client shows that there is a connection to the network. This seems to be an error, since the network resources cannot be accessed either.