Provide CLI output in json format

[fginther]

Please provide an option to output the results of a CLI command in json format. For example:

# testflinger list-queues
ATTENTION: This only shows a curated list of queues with descriptions, not ALL queues. If you can't find the queue you want to use, a job can still be submitted for queues not listed here.

Advertised queues on this server:
 201507-18697 - Dell Latitude E5570: Intel 8086:24f3 wifi, Core i5-6300U, dGPU AMD 1002:6900
 201606-22346 - Dell XPS 15 9550: Broadcom 14e4:43ba wifi, Core i7-6700HQ, dGPU nVidia 10de:139b
 201810-26513 - HP Z4 G4 Workstation - Z4 G4, ) XeonR W-2145 CPU, nVidia - 10de:1b30 GPU
 caracalla-gpa - Dell Caracalla (gpa sku)
...
# testflinger --output json list-queues
[
    {
        "queue": "201507-18697",
        "description": "Dell Latitude E5570: Intel 8086:24f3 wifi, Core i5-6300U, dGPU AMD 1002:6900"
    },
    {
        "queue": "201606-22346",
        "description": "Dell XPS 15 9550: Broadcom 14e4:43ba wifi, Core i7-6700HQ, dGPU nVidia 10de:139b"
    },
...
]

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CERTTF-478.

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