- forward updated labels/annotations for downward API compat

- refactor queue.Pod construction to take functional options, privatize Pod fields
- refactor DelayFIFO and HistoricalFIFO to offer consistent, more useful Pop() funcs
- refactor pod update processing changes; long term we should somehow combine with the special pod config source that we are using for mirror pods
- task launch timer cleanup

contrib/mesos/pkg/queue/delay_test.go

@@ -358,7 +358,7 @@ func TestDFIFO_sanity_check(t *testing.T) {
 
 	// pop last
 	before := time.Now()
-	x := df.Pop()
+	x := df.Pop(nil)
 	assert.Equal(a.(*testjob).instance, 2)
 
 	now := time.Now()
@@ -395,7 +395,7 @@ func TestDFIFO_Offer(t *testing.T) {
 	}
 
 	before := time.Now()
-	x := dq.Pop()
+	x := dq.Pop(nil)
 
 	now := time.Now()
 	waitPeriod := now.Sub(before)