Supported actions:
- start: install and start ctrld as a system service
- stop: stop the ctrld service
- restart: restart ctrld service
- status: show status of ctrld service
- uninstall: remove ctrld from system service
This commit adds the ability to start `ctrld` without config file. All
necessary information can be provided via command line flags, either in
base64 encoded config or launch arguments.
This commit adds config params to enable local DNS response caching and
control its behavior, allow tweaking the cache size, ttl override and
serving stale response.
