GEOMESA-334, 335 Add zookeepers, instance name and Separate Export from FeaturesTools

zookeepers and instance-name can be added to any command line argument. This is useful for cases where instanceName and zookeepers
cannot automatically be found. Additionally, auths and visibilities have been added to all commands. Finally, Export has been separated
out of FeaturesTools and Tools to add more flexibility in Export.
these should be the other way around, so that command line args take precedence (same in other classes): config.zookeepers.getOrElse(zookeepers)
config.zookeepers should be an Option[String]
also, the instanceName and zookeepers in AccumuloProperties should be lazy