ReST API: Use JSON documents for data input
ReST API: Use JSON documents for data input

This is more in keeping with how OpenStack resources are manipulated than
the previous implementation, which used WWW Forms encoding.

Change-Id: Iba7a6b83a65637cf999c67ef3f4dea7b3e64100d
Signed-off-by: Zane Bitter <1899fff8e7db19a598ee9d835aa1a232f82ea264@redhat.com>

maestro-hybrid-cloud/heat,dims/heat,srznew/heat,noironetworks/heat,Triv90/Heat,JioCloud/heat,NeCTAR-RC/heat,rh-s/heat,Triv90/Heat,pratikmallya/heat,varunarya10/heat,varunarya10/heat,dragorosson/heat,cryptickp/heat,jasondunsmore/heat,rickerc/heat_audit,Triv90/Heat,citrix-openstack-build/heat,steveb/heat,miguelgrinberg/heat,redhat-openstack/heat,rdo-management/heat,maestro-hybrid-cloud/heat,takeshineshiro/heat,gonzolino/heat,pshchelo/heat,srznew/heat,citrix-openstack-build/heat,takeshineshiro/heat,noironetworks/heat,dragorosson/heat,openstack/heat,ntt-sic/heat,openstack/heat,cwolferh/heat-scratch,gonzolino/heat,NeCTAR-RC/heat,ntt-sic/heat,jasondunsmore/heat,JioCloud/heat,cryptickp/heat,redhat-openstack/heat,pratikmallya/heat,rdo-management/heat,miguelgrinberg/heat,rickerc/heat_audit,cwolferh/heat-scratch,rh-s/heat,pshchelo/heat,steveb/heat,dims/heat