Update Wi-Fi configs restrictions

* Update isNetworkLockedDown in WifiUtils
  to check the profile owner if the device
  is an organization-owned managed profile
  device.
* Update the logic to check if a Wi-Fi
  network can be forgotten (for both the
  device owner and profile owner of an
  organization-owned device).

Bug: 150197944
Bug: 153605361
Test: manual testing
      make RunSettingsRoboTests -j ROBOTEST_FILTER=WifiDetailPreferenceController2Test
      make RunSettingsRoboTests -j ROBOTEST_FILTER=WifiUtilsTest

Manual Testing Steps
A. Provision TestDPC in 'Device Owner' mode.
   - Create a Wi-Fi config in TestDPC.
   - Enable 'DO created Wi-Fi configs are
     modifiable only by DO'.
   - Go to Settings and verify that the network
     created cannot be modified and the 'Forget'
     button is not displayed.
B. Provision TestDPC in 'Profile Owner of an
   organization-owned managed profile' mode.
   - Create a Wi-Fi config in the work profile
     instance of TestDPC.
   - Enable 'DO created Wi-Fi configs are
     modifiable only by DO'.
   - Go to Settings and verify that the network
     created cannot be modified and the 'Forget'
     button is not displayed.
C. Provision CtsVerifier in 'Device Owner' mode.
   - Go to 'Device owner tests' > 'Wifi
     configuration lockdown'.
   - Create a Wi-Fi config then follow the
     instructions.

Change-Id: Ie3c71113441a3aca62563310ad0e53d89fa04226

src/com/android/settings/wifi/WifiSettings2.java

@@ -491,7 +491,7 @@ public class WifiSettings2 extends RestrictedSettingsFragment
 
         // "forget" for normal saved network. And "disconnect" for ephemeral network because it
         // could only be disconnected and be put in blacklists so it won't be used again.
-        if (mSelectedWifiEntry.canForget()) {
+        if (canForgetNetwork()) {
             menu.add(Menu.NONE, MENU_ID_FORGET, 0 /* order */, R.string.forget);
         }
 
@@ -507,6 +507,11 @@ public class WifiSettings2 extends RestrictedSettingsFragment
         }
     }
 
+    private boolean canForgetNetwork() {
+        return mSelectedWifiEntry.canForget() && !WifiUtils.isNetworkLockedDown(getActivity(),
+                mSelectedWifiEntry.getWifiConfiguration());
+    }
+
     @Override
     public boolean onContextItemSelected(MenuItem item) {
         switch (item.getItemId()) {