Expect secret to be oldSecret

This was an error in an earlier change: the expectedSecret for this
change was actually oldSecret, not secret.

Author: grantr

pkg/admission/cert/writer/secret_test.go

@@ -298,7 +298,7 @@ var _ = Describe("SecretCertWriter", func() {
 							err = cl.List(nil, list, client.InNamespace("namespace-bar"))
 							Expect(err).NotTo(HaveOccurred())
 							Expect(list.Items).To(HaveLen(1))
-							Expect(list.Items[0]).To(Equal(secret))
+							Expect(list.Items).To(ConsistOf(*oldSecret))
 						})
 					})