Replication validation should reject RF > nodes in cluster

cqlsh> CREATE KEYSPACE mykeyspace WITH REPLICATION = { 'class' : 'SimpleStrategy', 'replication_factor' : 3 };
cqlsh> use mykeyspace ;
cqlsh:mykeyspace> CREATE TABLE users (
              ...   user_id int PRIMARY KEY, 
              ...   fname text, 
              ...   lname text
              ... );
cqlsh:mykeyspace> INSERT INTO users (user_id,  fname, lname) 
              ...   VALUES (1745, 'john', 'smith');
cqlsh:mykeyspace> select * from users;

 user_id | fname | lname
---------+-------+-------
    1745 |  john | smith