Cows probably outnumbered grapes when Carneros first became an AVA four decades ago.Back in 2003, Todd Graff started making wine at Frank Family Vineyards, and recalls what the AVA was like.“Carneros was pasture land with lots of dairy barns, sheep and cows,” Graff said. “There was not a lot of water out there. The invention of the drip system – which wasn’t common 40 years ago – you’d get a little water without overhead sprinkling or send it do…