Revert "GCE: Allow nodes to exceed target pool maximums"

This reverts commit faf0c44429.

pkg/util/rand/rand.go

@@ -81,19 +81,3 @@ func String(length int) string {
 	}
 	return string(b)
 }
-
-// A type that satisfies the rand.Shufflable interface can be shuffled
-// by Shuffle. Any sort.Interface will satisfy this interface.
-type Shufflable interface {
-	Len() int
-	Swap(i, j int)
-}
-
-func Shuffle(data Shufflable) {
-	rng.Lock()
-	defer rng.Unlock()
-	for i := 0; i < data.Len(); i++ {
-		j := rng.rand.Intn(i + 1)
-		data.Swap(i, j)
-	}
-}