Fixes incorrect json output for 'openstack server show -f json'.
The security group json output groups all the json as one
for e.g. "security_groups": "name='group1'\nname='group2'"
The correct output should be
"security_groups" : [{"name" : "group1"}, {"name" : "group2"}]
properties and volumes_attached fields also has similar issue.
Story: 2007755
Change-Id: I1b1cac716329e0530400aff782c08000b21d8e1d