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Introduces a new db key "<service>-previous" to track which instance was last selected for a particular service. This allows for filtering the list of available instances to exclude the instance that was last picked, to ensure a (slightly) more even distribution of traffic. There's still the possiblity of the following scenario, however: :service instances > 2 /:service request #1 -> instance #1 /:service request #2 -> instance #2 /:service request #3 -> instance #1 /:service request #4 -> instance #2 where there are many ignored instances for a particular service. One possible solution would be to implement the "<service>-previous" value to be a list, rather than a single value, and push to that list until only one element is left in the original "instance" array after filtering, and then delete the "<service>-previous" key.
