Implement REST API handler for Queueing

[thheinen]

In expectation of the need to have centralized systems which assign machines and scrub them after use, develop a REST/JSON handler for these with flexible mapping. Clients can then wait in line after requesting systems with certain criteria and return them afterwards for central recycling.

driver:
  name: static
  queueing: true
  request:
    type: json
    url: https://example.site/queueing/v1/request
  release:
    type: json
    url: https://example.site/queueing/v1/release
    method: POST
    data: { "hostname": "<%= STATIC_HOSTNAME %>"  }

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