Changes to accommodate client-go changes and kube vendor update

to v1.18.0

Signed-off-by: Humble Chirammal <hchiramm@redhat.com>

vendor/gopkg.in/square/go-jose.v2/jwt/validation.go

@@ -35,7 +35,7 @@ type Expected struct {
 	Audience Audience
 	// ID matches the "jti" claim exactly.
 	ID string
-	// Time matches the "exp" and "nbf" claims with leeway.
+	// Time matches the "exp", "nbf" and "iat" claims with leeway.
 	Time time.Time
 }