DES MOINES, IOWA — The Allsup’s burrito is about to have a new home. Yesway announced Tuesday that it has entered into a definitive agreement to purchase Allsup’s Convenience Stores, based in Clovis, N.M., subject to regulatory approval and customary closing conditions. Allsup’s, a nationally-renowned convenience retailer with a portfolio of more than 300 stores across Texas, New Mexico, and …