Improve upload-swift-artifacts handling of json data
Improve upload-swift-artifacts handling of json data

The "openstack container show" output changed, and the value of the
properties field is json (meaning that specifying "-f value" doesn't
eliminate the json formatting). This patch replaces sed to parse the
output with a jq expression that knows how to handle json.

Misc notes:
- Using "jq -r" tells jq not to quote the value of the Temp-URL-Key
- In the jq expression, "Temp-URL-Key" must be quoted or else the jq
  parser stumbles on the '-' dashes

Change-Id: Ife347f754ca9129580c092bb271bacdc032ae14b

openstack/tripleo-common,openstack/tripleo-common