Update kubernetes to 1.16.0-rc.2

Signed-off-by: Lantao Liu <lantaol@google.com>

vendor.conf

@@ -55,26 +55,26 @@ github.com/BurntSushi/toml v0.3.1
 # kubernetes dependencies
 sigs.k8s.io/yaml v1.1.0
 k8s.io/utils c2654d5206da6b7b6ace12841e8f359bb89b443c
-k8s.io/kubernetes v1.15.0
-k8s.io/klog v0.3.1
-k8s.io/cri-api kubernetes-1.15.0
-k8s.io/client-go kubernetes-1.15.0
-k8s.io/api kubernetes-1.15.0
-k8s.io/apiserver kubernetes-1.15.0
-k8s.io/apimachinery kubernetes-1.15.0
-gopkg.in/yaml.v2 v2.2.1
+k8s.io/kubernetes v1.16.0-rc.2
+k8s.io/klog v0.4.0
+k8s.io/cri-api kubernetes-1.16.0-rc.2
+k8s.io/client-go kubernetes-1.16.0-rc.2
+k8s.io/api kubernetes-1.16.0-rc.2
+k8s.io/apiserver kubernetes-1.16.0-rc.2
+k8s.io/apimachinery kubernetes-1.16.0-rc.2
+gopkg.in/yaml.v2 v2.2.2
 gopkg.in/inf.v0 v0.9.0
-golang.org/x/time f51c12702a4d776e4c1fa9b0fabab841babae631
-golang.org/x/oauth2 9f3314589c9a9136388751d9adae6b0ed400978a
-golang.org/x/crypto 88737f569e3a9c7ab309cdc09a07fe7fc87233c3
-github.com/stretchr/testify v1.2.2
+golang.org/x/time 85acf8d2951cb2a3bde7632f9ff273ef0379bcbd
+golang.org/x/oauth2 0f29369cfe4552d0e4bcddc57cc75f4d7e672a33
+golang.org/x/crypto 5c40567a22f818bd14a1ea7245dad9f8ef0691aa
+github.com/stretchr/testify v1.3.0
 github.com/seccomp/libseccomp-golang v0.9.1
 github.com/pmezard/go-difflib v1.0.0
 github.com/modern-go/reflect2 1.0.1
 github.com/modern-go/concurrent 1.0.3
-github.com/json-iterator/go 1.1.5
-github.com/google/gofuzz 24818f796faf91cd76ec7bddd72458fbced7a6c1
-github.com/emicklei/go-restful v2.2.1
+github.com/json-iterator/go v1.1.7
+github.com/google/gofuzz v1.0.0
+github.com/emicklei/go-restful v2.9.5
 github.com/docker/spdystream 449fdfce4d962303d702fec724ef0ad181c92528
 github.com/davecgh/go-spew v1.1.1