Fix -1:59 time bug
Fix -1:59 time bug

We were subtracting time.time() from time.time(), and when the
return values from those two separate calls didn't match we ended
up with a negative number.  Just read time.time() once and reuse the
value to avoid this situation.

cybertron/zuul-status,cybertron/zuul-status,cybertron/zuul-status