Several configuration file options ignored

[ghost]

I noticed that options in the config file like eventStream and logStartup are ignored, even if they are not overridden from the command line. I believe this is because in the command line parser, several options are returned even if they're not actually put on the command line: https://github.com/open-wc/es-dev-server/blob/master/src/command-line-args.ts#L271