Each metadataSet is represented as a 'node_template' in Tosca
mapped to a specific node type.
Support added for db operations of node templates as
independent entities.
Detailed documentation available here :
https://wiki.onap.org/display/DW/Enable+Handling+of+Policy+Type+Metadata
Issue-ID: POLICY-3832
Signed-off-by: zrrmmua <ramesh.murugan.iyer@est.tech>
Change-Id: I6c189142b1778ba858aae27cd92d4f136d950208