Provide CLI to retrieve status of a job or reservation

[fginther]

Testflinger allows for a reservation to be created for a device. However, it is the necessary to poll the job and watch the output to know when the device is ready and how to connect to it. This request is to proved that information via a status command:

$ testflinger status <job_id>
{
  "queue": "rpi3bp",
  "device": "rpi3bp-001",
  "ip": "1.2.3.4",
  "serial": 1.2.3.5:3000",
  "status": "READY",
  "reservation_remaining": 500
}

status could be used to indicate if the device is still "WAITING", is "PROVISIONING", "READY" for use, or the reservation has "TERMINATED" (or other values). Other values might be useful, but these are the ones that come to mind currently.

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CERTTF-343.

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