By Lisa Baertlein and Martinne Geller (Reuters) - Starbucks Corp and Danone SA said on Tuesday they agreed to sell a co-branded yogurt through Starbucks cafes and in grocery stores as yogurt makers battle for dominance in the $7 billion U.S. market. The partnership comes as Starbucks pushes into the "health and wellness" category and as Danone, owner of the Dannon brand, and other yogurt makers seek to conquer the U.S. market, where yogurt consumption lags Europe. Financial terms were not disclosed. The first product will be ready-to-eat Greek yogurt parfaits, to be sold in U.S. ...