Check_MK Werk 5171: Removed DEFAULT_GUI config

ID: 5171 Title: Removed DEFAULT_GUI config Component: Site Management Level: 1 Class: Bug fix Version: 1.5.0i1 Removed the DEFAULT_GUI configuration option from "omd config". It was meant to switch between different available GUIs in original OMD. In the current Check_MK packages only a single GUI is supported, that is the Check_MK default GUI. It is now enabled for all Check_MK sites. This change made some small performance improvements regarding the initial HTTP redirects possible. In case you acces http://host/[site]/ two redirects were made in the past. This has been reduced to a single redirect.