Function kwait::poll_infinite

pub fn poll_infinite<F>(
    interval: Duration, 
    condition: F
) -> Result<(), Box<dyn Error>> where
    F: Fn() -> Result<bool, Box<dyn Error>> + Copy, 

poll_infinite tries a condition func until it returns true or an error

poll_infinite always waits the interval before the run of 'condition'.

Some intervals may be missed if the condition takes too long or the time window is too short.