Use SPAI0 smoother in utest by default
Use SPAI0 smoother in utest by default

ddemidov/amgcl,dondieselkopf/amgcl,ddemidov/amgcl,huahbo/amgcl,ddemidov/amgcl,dondieselkopf/amgcl,huahbo/amgcl,huahbo/amgcl,dondieselkopf/amgcl,ddemidov/amgcl