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/FakeDataModel.java

@@ -48,7 +48,6 @@ import com.android.messaging.datamodel.data.SettingsData.SettingsDataListener;
 import com.android.messaging.datamodel.data.SubscriptionListData;
 import com.android.messaging.datamodel.data.TestDataFactory;
 import com.android.messaging.datamodel.data.VCardContactItemData;
-import com.android.messaging.util.ConnectivityUtil;
 
 public class FakeDataModel extends DataModel {
     private BackgroundWorker mWorker;
@@ -58,7 +57,6 @@ public class FakeDataModel extends DataModel {
     private ContactPickerData mContactPickerData;
     private MediaPickerData mMediaPickerData;
     private PeopleAndOptionsData mPeopleAndOptionsData;
-    private ConnectivityUtil mConnectivityUtil;
     private SyncManager mSyncManager;
     private SettingsData mSettingsData;
     private DraftMessageData mDraftMessageData;
@@ -102,11 +100,6 @@ public class FakeDataModel extends DataModel {
         return this;
     }
 
-    public FakeDataModel withConnectivityUtil(final ConnectivityUtil connectivityUtil) {
-        mConnectivityUtil = connectivityUtil;
-        return this;
-    }
-
     public FakeDataModel withSyncManager(final SyncManager syncManager) {
         mSyncManager = syncManager;
         return this;
@@ -219,11 +212,6 @@ public class FakeDataModel extends DataModel {
         return mActionService;
     }
 
-    @Override
-    public ConnectivityUtil getConnectivityUtil() {
-        return mConnectivityUtil;
-    }
-
     @Override
     public SyncManager getSyncManager() {
         return mSyncManager;