[Wi-Fi] Create WifiNetworkDetailsFragment related version 2 files for WifiTracker2 development

Create below version 2 files for WifiTracker2 development, we can
check the feature flag only a few times and easily remove version 1
files in the future.

    src/com/android/settings/wifi/details2/
    src/com/android/settings/wifi/savedaccesspoints2/
    tests/robotests/src/com/android/settings/wifi/details2/
    tests/robotests/src/com/android/settings/wifi/savedaccesspoints2/

Bug: 143326832
Test: make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.wifi.details2
      make RunSettingsRoboTests -j ROBOTEST_FILTER=com.android.settings.wifi.savedaccesspoints2

Change-Id: I4d2caf1ce313871605252395764b02747240f217

src/com/android/settings/wifi/savedaccesspoints2/SubscribedAccessPointsPreferenceController2.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.wifi.savedaccesspoints2;
+
+import android.content.Context;
+
+import com.android.settingslib.wifi.WifiSavedConfigUtils;
+
+import java.util.stream.Collectors;
+
+/**
+ * Controller that manages a PreferenceGroup, which contains a list of subscribed access points.
+ */
+public class SubscribedAccessPointsPreferenceController2 extends
+        SavedAccessPointsPreferenceController2 {
+
+    public SubscribedAccessPointsPreferenceController2(Context context, String preferenceKey) {
+        super(context, preferenceKey);
+    }
+
+    @Override
+    protected void refreshSavedAccessPoints() {
+        mAccessPoints = WifiSavedConfigUtils.getAllConfigs(mContext, mWifiManager).stream()
+                .filter(accessPoint -> accessPoint.isPasspointConfig())
+                .sorted(SavedNetworkComparator2.INSTANCE)
+                .collect(Collectors.toList());
+    }
+}