Add the cover case for 'body' kwarg in http json_request
Add the cover case for 'body' kwarg in http json_request

In the http json_request, it always data in the kwargs,
but the warning says use `data` instead.
So add the cover case for 'body' kwarg in http json_request

Change-Id: I4015c67241e6cd44a65871483750fe70d17e92d8
Closes-bug: #1535968

openstack/python-muranoclient,openstack/python-muranoclient