On Secret delete, don't check against the ResourceVersion.

On a Delete event, the ResourceVersion for the Secret is not the
same as previously stored when added or updated. pem.Have()
may have incorrectly concluded that the PEM file was not stored,
this fixes that error.

pkg/k8s/worker.go

@@ -86,7 +86,7 @@ func (worker *NamespaceWorker) update(secret *api_v1.Secret) Status {
 
 func (worker *NamespaceWorker) delete(secret *api_v1.Secret) Status {
 	if !worker.files.Have(secret.Namespace, secret.Name, string(secret.UID),
-		secret.ResourceVersion) {
+		"") {
 		return MakeNoop("pem file currently not stored")
 	}