Migrate more Secure settings to Global.

Migrate networking, storage, battery, DropBox, and PackageManager
related Secure settings to Global table.

Bug: 7232014, 7231331, 7231198
Change-Id: I772c2a9586a2f708c9db95622477f235064b8f4d
diff --git a/core/java/android/net/DnsPinger.java b/core/java/android/net/DnsPinger.java
index 11acabe..66f0fd0 100644
--- a/core/java/android/net/DnsPinger.java
+++ b/core/java/android/net/DnsPinger.java
@@ -295,8 +295,8 @@
     }
 
     private InetAddress getDefaultDns() {
-        String dns = Settings.Secure.getString(mContext.getContentResolver(),
-                Settings.Secure.DEFAULT_DNS_SERVER);
+        String dns = Settings.Global.getString(mContext.getContentResolver(),
+                Settings.Global.DEFAULT_DNS_SERVER);
         if (dns == null || dns.length() == 0) {
             dns = mContext.getResources().getString(
                     com.android.internal.R.string.config_default_dns_server);