Merge branch '2.7.x' of https://github.com/centreon/centreon into 2.7.x

www/class/centreon-clapi/centreonCentbrokerCfg.class.php

www/class/centreonContactgroup.class.php

www/class/config-generate/generate.class.php

...mmon/javascript/jquery/plugins/select2/js/select2.full.js

...de/common/javascript/jquery/plugins/select2/js/select2.js

...nclude/configuration/configGenerate/xml/generateFiles.php

...bject/service_template_model/listServiceTemplateModel.php

www/include/views/graphs/GetXmlGraph.php

www/include/views/graphs/graph.xsl

www/include/views/graphs/graphs.php

www/lib/HTML/QuickForm/select2.php