Device do network scan after user rotates NetworkSelection page

Add the networkSelectSettings fragment into new activity, and set
the activity's android:configChanges as
"orientation|keyboard|keyboardHidden|screenSize|screenLayout
|smallestScreenSize".

Bug: 204039043
Test: atest AutoSelectPreferenceControllerTest (pass)
atest OpenNetworkSelectPagePreferenceControllerTest (pass)
atest NetworkSelectSettingsTest (pass)

Change-Id: Ic933c2294401bc50e105ddcfd2a17886d0bbefc3

tests/unit/src/com/android/settings/network/telephony/NetworkSelectSettingsTest.java

@@ -122,10 +122,6 @@ public class NetworkSelectSettingsTest {
 
         public TargetClass(NetworkSelectSettingsTest env) {
             mTestEnv = env;
-
-            Bundle bundle = new Bundle();
-            bundle.putInt(Settings.EXTRA_SUB_ID, SUB_ID);
-            setArguments(bundle);
         }
 
         @Override
@@ -184,6 +180,11 @@ public class NetworkSelectSettingsTest {
         protected boolean enableAggregation(Context context) {
             return mTestEnv.mIsAggregationEnabled;
         }
+
+        @Override
+        protected int getSubId() {
+            return SUB_ID;
+        }
     }
 
     @Test