Add more assertions for test_count_columns.
Add more assertions for test_count_columns.

rightscale/cassandra,rightscale/cassandra,stipple/cassandra_new,rightscale/cassandra,stipple/cassandra_new,cassandra-rb/cassandra,stipple/cassandra_new,cassandra-rb/cassandra,cassandra-rb/cassandra,stipple/cassandra_new,cassandra-rb/cassandra