Fix confusing time zone terminology
Fix confusing time zone terminology

So now, application zone is the one defined in `config.time_zone`, and
system zone is the one in the computer where the application is running.

usabi/consul_san_borondon,consul/consul,consul/consul,usabi/consul_san_borondon,consul/consul,consul/consul,usabi/consul_san_borondon,consul/consul,usabi/consul_san_borondon