Checkmk Werk 13636: Fix xinetd installation problem on SLES15

ID: 13636 Title: Fix xinetd installation problem on SLES15 Component: Other Components Level: 1 Class: Bug fix Version: 2.2.0i1 When trying to install Checkmk on SLES15 this failed, because the package dependency 'xinetd' could not be provided by the official package repositories. It is not possible to get xinetd from official SLES package repositories, because it has been dropped in favour of systemd. The switch to systemd is possible, if you can register regular services to the systemd unit system and let systemd manage your units. But in our case, where we have an xinetd process that is managed as part of an OMD site, this way will not work. Users were able to solve the situation locally by installing xinetd from 3rd party sources, like for example OpenSUSE.org repositories. However, this approach is not supported by SLES nor straight forward for users. To make the installation more straight forward again, we now drop the xinetd package dependency for all supported SLES distributions from our Checkmk packages and ship xinetd together with Checkmk.