Cycle day editor and other confirmation dialogs.

Create dialog to edit "cycle day" when data usage resets.  Also added
dialogs to confirm enabling limit and restricting an application.

Change-Id: I1e08b17fabd1fcfc2f260807a61435d0ff1a8627

src/com/android/settings/net/NetworkPolicyModifier.java

@@ -36,6 +36,8 @@ import java.util.ArrayList;
  * about which policies can coexist.
  */
 public class NetworkPolicyModifier {
+    // TODO: refactor to "Editor"
+    // TODO: be more robust when missing policies from service
 
     private INetworkPolicyManager mPolicyService;
     private String mSubscriberId;