throw in extra test URLs for HttpDownloaderTest

These are commented out so that the tests aren't brittle when they run on
the CI builds.  But are easy to uncomment when testing locally.

app/src/androidTest/java/org/fdroid/fdroid/net/HttpDownloaderTest.java

@@ -22,6 +22,8 @@ public class HttpDownloaderTest {
             "https://f-droid.org/repo/index.jar",
             // sites that use SNI for HTTPS
             "https://guardianproject.info/fdroid/repo/index.jar",
+            //"https://microg.org/fdroid/repo/index.jar",
+            //"https://grobox.de/fdroid/repo/index.jar",
     };
 
     private boolean receivedProgress;