Generate linux tests

Author: dnadoba

Tests/AsyncHTTPClientTests/HTTPClientTests+XCTest.swift

@@ -144,6 +144,7 @@ extension HTTPClientTests {
             ("testMassiveDownload", testMassiveDownload),
             ("testShutdownWithFutures", testShutdownWithFutures),
             ("testMassiveHeaderHTTP1", testMassiveHeaderHTTP1),
+            ("testMassiveHeaderHTTP2", testMassiveHeaderHTTP2),
         ]
     }
 }