consumer: jitter might have no effect

[judwhite]

ticker starts when it's created. when it's created before waiting on jitter the jitter has no effect, unless jitter is greater than the tick interval.

example:

start := time.Now()

ticker := time.NewTicker(1500 * time.Millisecond)
time.Sleep(1000 * time.Millisecond)

<-ticker.C

fmt.Println(time.Now().Sub(start))

original PR was closed with rebase (oops) #113

[judwhite]

for clarity, jitter is always less than LookupdPollInterval

[mreiferson]

thanks!