Parameterized TOSCA template doesn't work

[Ladislav Smola]

I am not able to pass:

:attributes => {:param_values => params}})

where params is:
params = JSON.dump({'image_name' => 'cirros', 'flavor_name' => 'm1.small'})

Here is the full example:
https://gist.github.com/Ladas/b1c186b9bbefe0122604ee27fcfb62cb

So users need to dump the param values into JSON, so it saves to DB without issues and we need to parse it from JSON and encode, so it can be correctly used in Heat template

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/322805

[yong sheng gong (gongysh)]

this is duplicate to 1593030, but I think we can split it into param bug and codec bug.