Made sure that no subpartition stuff in non-subpartitioned table


mysql-test/r/partition.result:
  New test case
mysql-test/r/partition_mgm_err.result:
  Fixed bug in test case
mysql-test/t/partition.test:
  New test case
mysql-test/t/partition_mgm_err.test:
  Fixed bug in test case
sql/sql_partition.cc:
  Made sure that no subpartition stuff in non-subpartitioned table