[Settings] Refractor ApnSettings code to independent package folder.

Bug: 169750507
Test: make RunSettingsRoboTests
Change-Id: I8b2709ba8d16c625863d8a17abc3d0ab5d019bb8
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 189e1b6..0c4183d 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -422,7 +422,7 @@
             <meta-data android:name="com.android.settings.PRIMARY_PROFILE_CONTROLLED"
                 android:value="true" />
             <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
-                       android:value="com.android.settings.network.ApnSettings" />
+                       android:value="com.android.settings.network.apn.ApnSettings" />
         </activity>
 
         <!-- Keep compatibility with old shortcuts. -->
@@ -2003,7 +2003,7 @@
                 <data android:mimeType="vnd.android.cursor.dir/telephony-carrier" />
             </intent-filter>
             <meta-data android:name="com.android.settings.FRAGMENT_CLASS"
-                       android:value="com.android.settings.network.ApnEditor" />
+                       android:value="com.android.settings.network.apn.ApnEditor" />
         </activity>
 
         <activity