Update livestream mocks and add instructions how to run YoutubeStream…

…LiveExtractor test with the recording downloader successfully

extractor/src/test/java/org/schabi/newpipe/downloader/RecordingDownloader.java

@@ -76,6 +76,8 @@ public Response execute(@Nonnull final Request request) throws IOException,
                 response.responseCode(),
                 response.responseMessage(),
                 response.responseHeaders(),
+                // Uncomment this when running with the RecordingDownloader YoutubeLiveStreamExtractorTest
+                // response.responseBody(),
                 cleanedResponseBody,
                 response.latestUrl()
         );

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/stream/YoutubeStreamExtractorLivestreamTest.java

@@ -26,6 +26,9 @@ public class YoutubeStreamExtractorLivestreamTest extends DefaultStreamExtractor
     private static final String URL = YoutubeStreamExtractorDefaultTest.BASE_URL + ID + "&t=" + TIMESTAMP;
     private static StreamExtractor extractor;
 
+    // When you run this test with the RecordingDownloader, please uncomment line 80 and comment
+    // line 81. Otherwise, the test will fail because parsing the DASH manifest requires your IP
+    // address. You will have to remove it manually in the mocks.
     @BeforeClass
     public static void setUp() throws Exception {
         YoutubeParsingHelper.resetClientVersionAndKey();