Adds a new traits object to expose traits DB operations to the API. It
also adds a new traits field into the node object, with the appropriate
version compatibility logic.
get_node_by_port_addresses is modified to ensure we correctly join in
the tags and traits in that DB call, this avoids a orphaned db object
lazy load style failure.
_set_from_db_object in the base object is modified such that the new
traits object doesn't have to include the dictionary style compatibility
mix-in.
Change-Id: I69403b9875a020fab7a7975810b57bf646417953
Partial-Bug: #1722194
Co-Authored-By: Mark Goddard <mark@stackhpc.com>
John Garbutt
2cd7232f14