Check_MK Werk 5499: Implicit default values for agent updater config

ID: 5499 Title: Implicit default values for agent updater config Component: agents Level: 1 Class: Bug fix Version: 1.6.0i1 Some fields, namely the update interval and the proxy configuration (new since 1.5) are optional within the agent updater plugin configuration. With this werk, a default value of 3600 seconds for the interval and a default behavior of "ignore proxy settings" is assumed in the case that these fields are not set by the user. This matches the behavior of previous Check_MK releases.