Exceed quota on OWM and/or Wunderground when used in conjunction with Tempest

[dacarson]

When a Tempest weather station is configured, the update interval is hard coded to 1 minute as that is the frequency in which it broadcasts weather data on the local network. When a weather service is added, it is polled at the same update interval of every minute. This can exceed quotas, and result in requests failing (#291 (comment))
The update intervals should either be moved to per-weather service, or leave it global but internally update the Tempest weather data only every minute.