[pymtl] add sim tests for reduce_and, reduce_or, reduce_xor (#17)
[pymtl] add sim tests for reduce_and, reduce_or, reduce_xor (#17)

cornell-brg/pymtl,cfelton/pymtl,jjffryan/pymtl,Glyfina-Fernando/pymtl,cornell-brg/pymtl,cfelton/pymtl,Glyfina-Fernando/pymtl,tj93/pymtl,jjffryan/pymtl,Glyfina-Fernando/pymtl,jck/pymtl,jjffryan/pymtl,12yujim/pymtl,jck/pymtl,cornell-brg/pymtl,tj93/pymtl,12yujim/pymtl,tj93/pymtl,cfelton/pymtl,12yujim/pymtl,jck/pymtl