Sources say loyalty to current leader Aryeh Deri still strong, but graft probe leaves party heads preparing for the day after By Sue Surkes Yachad party leader Eli Yishai kisses the hand of Rabbi Meir Mazuz during press conference in Bnei Brak, December 25, 2014. (Photo by Yaakov Naumi/Flash90) Senior figures in the Shas Party have…