Add end-to-end tests for async/await (#528)

* add end to end tets

* enable testCanceling on linux

* Remove testConnectTimeout test

Author: dnadoba

Tests/AsyncHTTPClientTests/AsyncAwaitEndToEndTests+XCTest.swift

@@ -0,0 +1,43 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the AsyncHTTPClient open source project
+//
+// Copyright (c) 2018-2019 Apple Inc. and the AsyncHTTPClient project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of AsyncHTTPClient project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+//
+// AsyncAwaitEndToEndTests+XCTest.swift
+//
+import XCTest
+
+///
+/// NOTE: This file was generated by generate_linux_tests.rb
+///
+/// Do NOT edit this file directly as it will be regenerated automatically when needed.
+///
+
+extension AsyncAwaitEndToEndTests {
+    static var allTests: [(String, (AsyncAwaitEndToEndTests) -> () throws -> Void)] {
+        return [
+            ("testSimpleGet", testSimpleGet),
+            ("testSimplePost", testSimplePost),
+            ("testPostWithByteBuffer", testPostWithByteBuffer),
+            ("testPostWithSequenceOfUInt8", testPostWithSequenceOfUInt8),
+            ("testPostWithCollectionOfUInt8", testPostWithCollectionOfUInt8),
+            ("testPostWithRandomAccessCollectionOfUInt8", testPostWithRandomAccessCollectionOfUInt8),
+            ("testPostWithAsyncSequenceOfByteBuffers", testPostWithAsyncSequenceOfByteBuffers),
+            ("testPostWithAsyncSequenceOfUInt8", testPostWithAsyncSequenceOfUInt8),
+            ("testPostWithFragmentedAsyncSequenceOfByteBuffers", testPostWithFragmentedAsyncSequenceOfByteBuffers),
+            ("testPostWithFragmentedAsyncSequenceOfLargeByteBuffers", testPostWithFragmentedAsyncSequenceOfLargeByteBuffers),
+            ("testCanceling", testCanceling),
+            ("testDeadline", testDeadline),
+            ("testInvalidURL", testInvalidURL),
+        ]
+    }
+}