Hinted Handoff Queue

Hinted handoff is a concept that is used in Cassandra and Amazon's Dynamo for dealing with failed remote writes.

The files queue.go, limiter.go and node_processor.go (and their tests) were taken from InfluxDB 0.11.1:

https://github.com/influxdata/influxdb/tree/v0.11.1/services/hh

These files were released under the MIT license.