Prioritize REDIS_SENTINEL over REDIS_HOST #498
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REDIS_HOST is required by librenms web app, but Python web app supports either a redis host or a redis sentinel host to get master.
The documentation and configuration examples tells you that you need to set
REDIS_HOSTvariable. And if you try to addREDIS_SENTINELinto the mix to support distributed pollers, you may end up in a situation where poller does not start becauseREDIS_HOSTvariable is already set.This fix ensures that
REDIS_SENTINELvariable takes precedence overREDIS_HOSTif set.See issue on this: #475