Check_MK Werk 5264: cmk-update-agent: Improve logging under windows

ID: 5264 Title: cmk-update-agent: Improve logging under windows Component: agents Level: 1 Class: Bug fix Version: 1.5.0i2 With this werk, the Agent Updater ensures that there is a logging infrastructure (i.e. log-dir within agent-installation-dir) is available when running as plugin. Additionally, an MSI-Installation log will be written on update if there is a log-dir available.