docstring for waitforconn has incorrect interface for callbackfunction

[us341]

Docstring specifies that the callback function should take single argument as RepySocketObject. But it is actually taking five arguments: (remoteip, remoteport, socketlikeobj, thiscommhandle, listencommhandle)

https://github.com/SeattleTestbed/seattlelib_v2/blob/master/librepysocket.r2py#L629

[aaaaalbert]

@us341 please feel free to propose a corrected version!