Checkmk Werk 15254: Fixed incorrect availability calculation when a host was removed and added again

ID: 15254 Title: Fixed incorrect availability calculation when a host was removed and added again Component: cmc Level: 1 Class: Bug fix Version: 2.3.0b1 The availability information was not updated when a new host got re-introduced and the CMC was only reloaded, which resulted in "No information about that period of time available" for such a host. Only a CMC restart fixed the calculation, but with this fix a reload is enough.