Change trait edge labels to have trait name alone

Currently when traits are added to classes they are added with typeName.traitName and this is causing edge label creation to fail when concurrent threads are running transactions. Event though adding retries mitigates the issue to some extent in ATLAS-1119 and lets the transactions succeed, there is lesser chance of them failing with edge label creation due to concurrent transactions with the proposed change since this is a one time operation that is done once per trait when it is added the first time to any entity. Also this could potentially be moved to type creation phase when the trait is created.