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/secondary_test.go

@@ -125,7 +125,6 @@ func TestTransferIn(t *testing.T) {
 	defer s.Shutdown()
 
 	z := new(Zone)
-	z.Expired = new(bool)
 	z.origin = testZone
 	z.TransferFrom = []string{addrstr}
 
@@ -140,7 +139,6 @@ func TestTransferIn(t *testing.T) {
 
 func TestIsNotify(t *testing.T) {
 	z := new(Zone)
-	z.Expired = new(bool)
 	z.origin = testZone
 	state := newRequest(testZone, dns.TypeSOA)
 	// need to set opcode