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
c97180ce00