ProcessPendingMessagesAction works based on subscriptions

PorcessPendingMessagesAction queues one message for sending/downloading
associated with a subscription triggering current action at a time. And
the ConnectivityUtil also works based on subscriptions so that pending
messages can be processed regardless of other phones' state in multi-sim
case.

It includes cleanup code as well.

Test: Manual

Change-Id: Id6b4f4a0aa6a3291e7a4d8a5d3f0fbb9db3c5b86
Signed-off-by: Taesu Lee <taesu82.lee@samsung.com>

tests/src/com/android/messaging/datamodel/action/ReadWriteDraftMessageActionTest.java

@@ -36,7 +36,6 @@ import com.android.messaging.datamodel.MediaScratchFileProvider;
 import com.android.messaging.datamodel.MessagingContentProvider;
 import com.android.messaging.datamodel.action.ActionTestHelpers.StubActionService;
 import com.android.messaging.datamodel.action.ActionTestHelpers.StubActionService.StubActionServiceCallLog;
-import com.android.messaging.datamodel.action.ActionTestHelpers.StubConnectivityUtil;
 import com.android.messaging.datamodel.action.ReadDraftDataAction.ReadDraftDataActionListener;
 import com.android.messaging.datamodel.data.MessageData;
 import com.android.messaging.datamodel.data.MessagePartData;
@@ -473,8 +472,7 @@ public class ReadWriteDraftMessageActionTest extends BugleTestCase {
 
         mService = new StubActionService();
         final FakeDataModel fakeDataModel = new FakeDataModel(context)
-                .withActionService(mService)
-                .withConnectivityUtil(new StubConnectivityUtil(context));
+                .withActionService(mService);
         FakeFactory.registerWithFakeContext(getTestContext(), context)
                 .withDataModel(fakeDataModel);