DFS Channel Availability Timer time

When an AP or e/PTP master boots, it would be nice if a timer was displayed by the CAC check in the DFS Status field.  Simply update the value every 5 seconds with the GUI.  It is very nice to watch the timer on other products go down so you know when to expect the link to come back up.

Thanks for the idea, Josh. For the time being, just remember that the CAC timer is 63 seconds. No more, no less.