Determine if FluoExec should read config from Zookeeper

Prior to #883, FluoExec read all configuration in fluo.properties and provided user with `FluoConfiguration` with everything set. After #883, all configuration is still provided but it is read from Zookeeper. This keeps expected behaviour but requires the Fluo application to be initialized and Zookeeper to be running. This ticket is figure out the best behaviour. If the read from Zookeeper is removed, commands that use FluoExec like OptimizeTable in Fluo Recipes will need to be modified.