Fix: viper.UnmarshalKey ignores defaults

This seems to be a bug in viper, as soon as we're working with subkeys, things fall apart

webapi/config.go

@@ -22,7 +22,11 @@ func SetConfigDefaults() {
 }
 
 func LoadConfig() {
-	viper.UnmarshalKey("WebAPI", &C)
+	// Does not work with partially overrides, only GetXXX does resolve the subkeys correctly
+	// https://github.com/spf13/viper/issues/798
+	// https://github.com/spf13/viper/issues/309
+	// viper.UnmarshalKey("WebAPI", &C)
+	C.ListenAddress = viper.GetString("WebAPI.ListenAddress")
 }
 
 func (obj *config) PrettyPrint() string {