Merge branch '2.8.x' of https://github.com/centreon/centreon into 2.8.x

Jenkinsfile

config/wiki.conf.php

cron/centAcl-Func.php

doc/en/api/clapi/objects/settings.rst

doc/en/release_notes/centreon-2.8/centreon-2.8.5.rst

doc/en/upgrade/from_sources.rst

doc/fr/api/clapi/objects/settings.rst

doc/fr/release_notes/centreon-2.8/centreon-2.8.5.rst

tmpl/vardistrib/defaults

varinstall/vars

www/Themes/Centreon-2/style.css

www/api/class/centreon_metric.class.php

www/api/class/centreon_wiki.class.php

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

www/class/centreon-knowledge/procedures.class.php

www/class/centreon-knowledge/procedures_Proxy.class.php

www/class/centreonGraphPoller.class.php

www/class/centreonGraphService.class.php

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

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