Changed WL#1424 to use the function ha_find_files. This is a simpler implementation and all handler specific code is hidden in the appropriate handler.


mysql-test/r/ndb_autodiscover.result:
  Update test result, number of rows is 1
mysql-test/t/ndb_autodiscover.test:
  Dont run the test where table is dropped in NDb with ndb_drop_table
sql/ha_ndbcluster.cc:
  Implement function ndbcluster_find_files which will discover new tables and delete old tables
sql/ha_ndbcluster.h:
  Implement function ndbcluster_find_files 
  Remove function ndbcluster_list_tables and ndbcluster_can_discover
sql/handler.cc:
  Add ha_find_files called from mysql_find_files
  Remove ha_can_discover and ha_list_tables
sql/handler.h:
  Add ha_find_files called from mysql_find_files
  Remove ha_can_discover and ha_list_tables
sql/sql_show.cc:
  Revert to original version of sql_show.cc
  Only changes to this version is that ha_find_files is called from mysql_find_files in order to give the handlers a possibility to find new files in engine