Discover Server features right after connection.
In the same time, postpone the load of the roster.
This avoid a timeout on the discovery request sent to the server.
The timeout is caused by receiving big rosters.
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@+id/privacy_list_context_menu_buddies_item"
android:title="@string/privacy_list_select_dialog_buddies" />
<item android:id="@+id/privacy_list_context_menu_groups_item"
android:title="@string/privacy_list_select_dialog_groups" />
<item android:id="@+id/privacy_list_context_menu_delete_item"
android:title="@string/privacy_list_select_dialog_delete" />
</menu>