BUG#19122: Need to close all handlers before rename/drop phase in ALTER TABLE ADD/DROP/REORGANIZE partitions
After review fix


mysql-test/r/partition.result:
  Fixes for test
mysql-test/t/partition.test:
  Fixes for test
sql/lock.cc:
  After review fix
sql/mysql_priv.h:
  After review fix
sql/sql_partition.cc:
  After review fix