Filter resource types by support status

Now heat resources haven't support status. We want service providers
to have a way to assign support status metadata to resources. And
then user should be able to filter resource types by support status
when quering the api for resource types.

Add processing of query parameter support_status to list_resource_types
function in heat/api to filter resources by. List_resource_types
returns a list of resources with a certain status or a list of all
resource types by default.

Add filtering on the server.

Add changes to tests:
- test_rpc_client.py
- test_api_openstack_v1.py
- test_engine_service.py

Implements bp filter-resources-by-support

Change-Id: I719c0d690886153adb698aea4695ddd526e7a4af
Merge "Filter resource types by support status"