Merge "Track changes to network security config manifest configuration" into mnc-mr-docs

<pre>

<?xml version="1.0" encoding="utf-8"?>

<manifest ... >

  <application ... >

    <meta-data android:name="android.security.net.config"

               android:resource="@xml/network_security_config" />

  <application android:networkSecurityConfig="@xml/network_security_config"

               ... >

    ...

  </application>

</manifest>