Fixes races in test and klog (#3079)

Various fixes to make things less flaky:

* kubernetes: put klog.SetOutput in the setup function, not in the init
  function to see if that helps
* file: make z.Expired a boolean instead of a pointer to a boolean
* test: fix TestSecondaryZoneTransfer test, which wasn't actually
  testing in the right way. It's more right now, but may still be racy
  (race introduced because a file's lazy loading of zones)

Signed-off-by: Miek Gieben <miek@miek.nl>

plugin/file/zone.go

@@ -22,7 +22,7 @@ type Zone struct {
 	file    string
 	*tree.Tree
 	Apex
-	Expired *bool
+	Expired bool
 
 	sync.RWMutex
 
@@ -46,16 +46,13 @@ type Apex struct {
 
 // NewZone returns a new zone.
 func NewZone(name, file string) *Zone {
-	z := &Zone{
+	return &Zone{
 		origin:         dns.Fqdn(name),
 		origLen:        dns.CountLabel(dns.Fqdn(name)),
 		file:           filepath.Clean(file),
 		Tree:           &tree.Tree{},
-		Expired:        new(bool),
 		reloadShutdown: make(chan bool),
 	}
-	*z.Expired = false
-	return z
 }
 
 // Copy copies a zone.