Add support for marking nodes as unavailable. #14
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Marking a node as unavailable will temporarily remove it from the cluster and add it back after a delay. If the node continues to fail the delay before adding it back will increase.
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While using memcachir we've noticed occasions where a node in our Elasticache cluster will become unavailable, but still be returned in the health check, causing errors when trying to send requests to it. This change would allow us to handle those errors and mark the node as temporarily unavailable.
With these changes, unavailable nodes are temporarily removed from the cluster and excluded from health check results until a timeout expires. After a configurable delay they are added back where they can be retried. If a node continues to fail, the delay before adding it back in will be increased.