This takes a lighter weight approach to allowing output to be formatted
as JSON than switching over to using cliff. This adds the --json flag
argument that will format the printed results in a much more compact
JSON format.
Change-Id: I54f3f347b0d7da4385ffcbfa5da61c83657f390c
Signed-off-by: Sean McGinnis <sean.mcginnis@gmail.com>