istio-manifests: remove external currency api (#175)

this is not unused per #173.

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

istio-manifests/whitelist-egress-currencyprovider.yaml

@@ -1,28 +0,0 @@
-# Copyright 2018 Google LLC
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-apiVersion: networking.istio.io/v1alpha3
-kind: ServiceEntry
-metadata:
-  name: currency-provider-external
-spec:
-  hosts:
-  - www.ecb.europa.eu
-  ports:
-  - number: 80
-    name: http
-    protocol: HTTP
-  - number: 443
-    name: https
-    protocol: HTTPS