it's about mysql_admin_commands not being reexecution-safe
(and CHECK still isn't)


mysql-test/r/sp-error.result:
  optimize is now allowed in SP
mysql-test/r/sp.result:
  test repair/optimize/analyze in SP
mysql-test/t/backup.test:
  clean up after itself
mysql-test/t/sp-error.test:
  optimize is now allowed in SP
mysql-test/t/sp.test:
  test repair/optimize/analyze in SP
sql/sp_head.cc:
  all mysql_admin commands return result set
sql/sql_parse.cc:
  all mysql_admin commands modify table list and we should restore it for SP
sql/sql_table.cc:
  optimization - don't execute views when no view is expected/allowed
sql/sql_yacc.yy:
  optimize is now allowed in SP