Revert "Refactor IpConfiguration from WifiConfiguration"

This reverts commit f56e213f68fd847df55ae202508825224363cbb3.

Change-Id: I552d32dc45580f80038d84abc1ccefe66d6835d9
diff --git a/src/com/android/managedprovisioning/WifiConfig.java b/src/com/android/managedprovisioning/WifiConfig.java
index ffaab42..332a79c 100644
--- a/src/com/android/managedprovisioning/WifiConfig.java
+++ b/src/com/android/managedprovisioning/WifiConfig.java
@@ -16,9 +16,9 @@
 
 package com.android.managedprovisioning;
 
-import android.net.IpConfiguration.ProxySettings;
 import android.net.ProxyProperties;
 import android.net.wifi.WifiConfiguration;
+import android.net.wifi.WifiConfiguration.ProxySettings;
 import android.net.wifi.WifiManager;
 import android.text.TextUtils;