NOVATO — One of the results of Diageo Chateau & Estate Wines’ recent sales of wine assets is providing corporate alcoholic beverage brand creator Winery Exchange with a line of its own products.Winery Exchange has created dozens of wine, beer and spirits brands for grocers, restaurants, retailers and other clients but earlier this year the Novato-based company made its first brand acquisition, picking up the Echelon Vineyards brand, launched in 1998, from Diageo for an undisclosed amount.