code: public List<String> listTraits(final String guid) throws AtlasServiceException {
          JSONObject jsonResponse = callAPIWithBodyAndParams(API.LIST_TRAITS, null, guid, URI_TRAITS);
          return extractResults(jsonResponse, AtlasClient.RESULTS, new ExtractOperation<String, String>());
      }
docs: List traits for a given entity identified by its GUID
  @param guid GUID of the entity
  @return List<String> - traitnames associated with entity
  @throws AtlasServiceException