metadata plugin update statuses in wrapped langs

src/csharp/Grpc.IntegrationTesting/MetadataCredentialsTest.cs

@@ -162,7 +162,7 @@ namespace Grpc.IntegrationTesting
             client = new TestService.TestServiceClient(channel);
 
             var ex = Assert.Throws<RpcException>(() => client.UnaryCall(new SimpleRequest { }));
-            Assert.AreEqual(StatusCode.Unauthenticated, ex.Status.StatusCode);
+            Assert.AreEqual(StatusCode.Unavailable, ex.Status.StatusCode);
         }
 
         private class FakeTestService : TestService.TestServiceBase

src/php/tests/unit_tests/CallCredentials2Test.php

@@ -147,7 +147,7 @@ class CallCredentials2Test extends PHPUnit_Framework_TestCase
 
         $this->assertTrue($event->send_metadata);
         $this->assertTrue($event->send_close);
-        $this->assertTrue($event->status->code == Grpc\STATUS_UNAUTHENTICATED);
+        $this->assertTrue($event->status->code == Grpc\STATUS_UNAVAILABLE);
     }
 
     public function invalidReturnCallbackFunc($context)
@@ -179,6 +179,6 @@ class CallCredentials2Test extends PHPUnit_Framework_TestCase
 
         $this->assertTrue($event->send_metadata);
         $this->assertTrue($event->send_close);
-        $this->assertTrue($event->status->code == Grpc\STATUS_UNAUTHENTICATED);
+        $this->assertTrue($event->status->code == Grpc\STATUS_UNAVAILABLE);
     }
 }

src/ruby/spec/generic/client_stub_spec.rb

@@ -228,7 +228,7 @@ describe 'ClientStub' do
         th.join
       end
 
-      it 'should receive UNAUTHENTICATED if call credentials plugin fails' do
+      it 'should receive UNAVAILABLE if call credentials plugin fails' do
         server_port = create_secure_test_server
         th = run_request_response(@sent_msg, @resp, @pass)
 
@@ -252,7 +252,7 @@ describe 'ClientStub' do
         unauth_error_occured = false
         begin
           get_response(stub, credentials: creds)
-        rescue GRPC::Unauthenticated => e
+        rescue GRPC::Unavailable => e
           unauth_error_occured = true
           expect(e.details.include?(error_message)).to be true
         end