Format attributes as JSON in resource-show output
Format attributes as JSON in resource-show output

Format the attributes as indented JSON to improve the output format
of command resource-show.

Change-Id: I5a72f12c7710c782cbc0e89483d271ab86bddc3c
Closes-Bug: #1394094

openstack/python-heatclient,tcpcloud/python-heatclient,rdo-management/python-heatclient,ecerulm/python-heatclient,tcpcloud/python-heatclient,ecerulm/python-heatclient,rdo-management/python-heatclient