Sections are changed into pure widget objects. Introduced IPA.composite_widget, basic widget for widget nesting (it's using IPA.widget_container). It's base class for section widgets. TODO: change old custom sections into custom fields and widgets. Note: usage of section in HBAC and SUDO is kept - whole logic will be removed in #1515 patch. https://fedorahosted.org/freeipa/ticket/2040
http://www.freeipa.org/page/UI_Unit_Tests