Fixed a missed case in the patch for Bug#31931.
Also makes Bug#33722 a duplicate of Bug#31931.
Added tests for better coverage.
Replaced some legacy function calls.


mysql-test/r/partition.result:
  Added tests for better coverage
mysql-test/r/partition_datatype.result:
  Added tests for better coverage
mysql-test/r/partition_error.result:
  Added tests for better coverage
mysql-test/suite/parts/inc/partition_engine.inc:
  Bug#31931: Mix of handlers error message
  
  Bug#33722 is fixed within this patch too
mysql-test/suite/parts/r/partition_engine_innodb.result:
  Bug#31931: Mix of handlers error message
  
  Bug#33722 is fixed within this patch too
mysql-test/suite/parts/r/partition_engine_myisam.result:
  Bug#31931: Mix of handlers error message
  
  Bug#33722 is fixed within this patch too
mysql-test/t/partition.test:
  Added tests for better coverage
mysql-test/t/partition_datatype.test:
  Added tests for better coverage
mysql-test/t/partition_error.test:
  Added tests for Bug#31931
sql/partition_info.cc:
  Bug#31931: Mix of handlers error message
  
  Fixed case where given info->db_type not matched
  thd->lex->create_info.db_type
  
  And the check for inconsistent subpartition engines-clauses.
sql/sql_partition.cc:
  Changed ha_legacy_type to ha_resolve_storage_engine_name
sql/sql_table.cc:
  Changed ha_legacy_type to ha_resolve_storage_engine_name