Initialize the xmpp connection config in a background thread.
On android > 3.x network operations on the main thread crash the application.
This move the dns request made by the ConnectionConfiguration in another
thread by lazily initializing the XMPPConnection
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<gradient android:startColor="#505050" android:endColor="#C0C0C0"
android:angle="0"/>
<corners android:radius="0dp" />
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