Simple cleanups to Tethering

- regroup together static final class fields, final instance fields, and
  mutable instance fields.
- uses correct Android naming conventions for instance fields.
- reorder imports correctly.

Test: no functional change.
Change-Id: If3d73bc28972a004c2ba3cc14d869a2a679abfce

services/core/java/com/android/server/ConnectivityService.java

@@ -3087,8 +3087,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
     }
 
     @Override
-    public void startTethering(int type, ResultReceiver receiver,
-            boolean showProvisioningUi) {
+    public void startTethering(int type, ResultReceiver receiver, boolean showProvisioningUi) {
         ConnectivityManager.enforceTetherChangePermission(mContext);
         if (!isTetheringSupported()) {
             receiver.send(ConnectivityManager.TETHER_ERROR_UNSUPPORTED, null);