change key listing strategy to use SCAN #7
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This fixed the key listing set leak that occurs when keys are expiring as described in :
https://rt.cpan.org/Public/Bug/Display.html?id=112760
This instead uses the SCAN method of Redis to list the keys.
This has the downside of requiring redis 2.8+ and being slower than the previous implementation.
Also, Test::Mock::Redis doesn't implement the SCAN method so unit tests will only succeed when testing against a real Redis instance