Checkmk Werk 10239: Fix agent host diagnose mostly affecting windows hosts

ID: 10239 Title: Fix agent host diagnose mostly affecting windows hosts Component: WATO Level: 1 Class: Bug fix Version: 1.7.0i1 The "Agent" box of the host diagnose page was not returning a result when contacting some hosts. This was mostly affecting windows hosts, but could also affect other hosts. The problem was caused by non ASCII characters in the agent output, which made the processing fail. We now first try to decode the agent output with UTF-8, in case this fail we fallback to the "fallback agent output encoding", which is latin-1. When this also fails we replace the non decodable characters with some place holder.