use istio client-go library instead of knative (#1661)

use istio client-go library instead of knative
bump kubernetes dependency version
change code coverage to codecov

vendor/istio.io/api/policy/v1beta1/http_response.proto

@@ -0,0 +1,101 @@
+// Copyright 2019 Istio Authors
+//
+// 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.
+
+syntax = "proto3";
+
+package istio.policy.v1beta1;
+
+option go_package="istio.io/api/policy/v1beta1";
+
+// Direct HTTP response for a client-facing error message which can be attached
+// to an RPC error.
+message DirectHttpResponse {
+  // HTTP status code. If not set, RPC error code is used.
+  HttpStatusCode code = 1;
+
+  // HTTP response body.
+  string body = 2;
+
+  // HTTP response headers.
+  map<string, string> headers = 3;
+}
+
+// HTTP response codes.
+// For more details: http://www.iana.org/assignments/http-status-codes/http-status-codes.xhtml
+enum HttpStatusCode {
+  // Empty - This code not part of the HTTP status code specification, but it is needed for proto
+  // `enum` type.
+  Empty = 0;
+
+  Continue = 100;
+
+  OK = 200;
+  Created = 201;
+  Accepted = 202;
+  NonAuthoritativeInformation = 203;
+  NoContent = 204;
+  ResetContent = 205;
+  PartialContent = 206;
+  MultiStatus = 207;
+  AlreadyReported = 208;
+  IMUsed = 226;
+
+  MultipleChoices = 300;
+  MovedPermanently = 301;
+  Found = 302;
+  SeeOther = 303;
+  NotModified = 304;
+  UseProxy = 305;
+  TemporaryRedirect = 307;
+  PermanentRedirect = 308;
+
+  BadRequest = 400;
+  Unauthorized = 401;
+  PaymentRequired = 402;
+  Forbidden = 403;
+  NotFound = 404;
+  MethodNotAllowed = 405;
+  NotAcceptable = 406;
+  ProxyAuthenticationRequired = 407;
+  RequestTimeout = 408;
+  Conflict = 409;
+  Gone = 410;
+  LengthRequired = 411;
+  PreconditionFailed = 412;
+  PayloadTooLarge = 413;
+  URITooLong = 414;
+  UnsupportedMediaType = 415;
+  RangeNotSatisfiable = 416;
+  ExpectationFailed = 417;
+  MisdirectedRequest = 421;
+  UnprocessableEntity = 422;
+  Locked = 423;
+  FailedDependency = 424;
+  UpgradeRequired = 426;
+  PreconditionRequired = 428;
+  TooManyRequests = 429;
+  RequestHeaderFieldsTooLarge = 431;
+
+  InternalServerError = 500;
+  NotImplemented = 501;
+  BadGateway = 502;
+  ServiceUnavailable = 503;
+  GatewayTimeout = 504;
+  HTTPVersionNotSupported = 505;
+  VariantAlsoNegotiates = 506;
+  InsufficientStorage = 507;
+  LoopDetected = 508;
+  NotExtended = 510;
+  NetworkAuthenticationRequired = 511;
+}