def clear_system_defaults
      @region = nil if @region == Rudy::DEFAULT_REGION
      @zone = nil if @zone == Rudy::DEFAULT_ZONE
      @environment = nil if @environment == Rudy::DEFAULT_ENVIRONMENT
      @role = nil if @role == Rudy::DEFAULT_ROLE
      @localhost = nil if @localhost == (Rudy.sysinfo.hostname || 'localhost')
      @auto = nil if @auto == false
    end
def clear_system_defaults
      @region = nil if @region == Rudy::DEFAULT_REGION
      @zone = nil if @zone == Rudy::DEFAULT_ZONE
      @environment = nil if @environment == Rudy::DEFAULT_ENVIRONMENT
      @role = nil if @role == Rudy::DEFAULT_ROLE
      @localhost = nil if @localhost == (Rudy.sysinfo.hostname || 'localhost')
      @auto = nil if @auto == false
    end
Unapply defaults for parameters that must have values.
 This is important when reloading configuration since
 we don't overwrite existing values. If the default
 ones remained the configuration would not be applied.