Remove System.out.print's. Replace with Logs where appropriate.

Some were removed and left removed if they were run during tests,
because the tests are supposed to be automated and the noise they added
would not have helped diagnose a failure.

Also removed the dead code around "uses-feature" which will never
get implemented, especially as it is in the XML index.

app/src/androidTest/java/org/fdroid/fdroid/compat/FileCompatTest.java

@@ -6,6 +6,7 @@ import android.os.Build;
 import android.os.Environment;
 import android.support.test.InstrumentationRegistry;
 import android.support.test.runner.AndroidJUnit4;
+import android.util.Log;
 
 import org.fdroid.fdroid.AssetUtils;
 import org.fdroid.fdroid.data.SanitizedFile;
@@ -30,6 +31,8 @@ import static org.junit.Assume.assumeTrue;
 @RunWith(AndroidJUnit4.class)
 public class FileCompatTest {
 
+    private static final String TAG = "FileCompatTest";
+
     private SanitizedFile sourceFile;
     private SanitizedFile destFile;
 
@@ -47,11 +50,11 @@ public class FileCompatTest {
     @After
     public void tearDown() {
         if (!sourceFile.delete()) {
-            System.out.println("Can't delete " + sourceFile.getAbsolutePath() + ".");
+            Log.w(TAG, "Can't delete " + sourceFile.getAbsolutePath() + ".");
         }
 
         if (!destFile.delete()) {
-            System.out.println("Can't delete " + destFile.getAbsolutePath() + ".");
+            Log.w(TAG, "Can't delete " + destFile.getAbsolutePath() + ".");
         }
     }
 

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

@@ -46,16 +46,12 @@ public class HttpDownloaderTest {
         final CountDownLatch latch = new CountDownLatch(1);
         String urlString = "https://f-droid.org/repo/index.jar";
         receivedProgress = false;
-        System.out.println("downloadUninterruptedTestWithProgress: " + urlString);
-        receivedProgress = false;
         URL url = new URL(urlString);
         File destFile = File.createTempFile("dl-", "");
         final HttpDownloader httpDownloader = new HttpDownloader(url, destFile);
         httpDownloader.setListener(new ProgressListener() {
             @Override
             public void onProgress(URL sourceUrl, int bytesRead, int totalBytes) {
-                System.out.println("DownloaderProgressListener.sendProgress "
-                        + sourceUrl + " " + bytesRead + " / " + totalBytes);
                 receivedProgress = true;
             }
         });
@@ -118,7 +114,6 @@ public class HttpDownloaderTest {
         httpDownloader.setListener(new ProgressListener() {
             @Override
             public void onProgress(URL sourceUrl, int bytesRead, int totalBytes) {
-                System.out.println("DownloaderProgressListener.sendProgress " + bytesRead + " / " + totalBytes);
                 receivedProgress = true;
                 latch.countDown();
             }