illegal state".

We should not assume that mysql.proc table does not exist if we are
unable to open it under LOCK TABLES or in prelocked mode (and
remember this fact by setting mysql_proc_table_exists to zero).


mysql-test/r/sp.result:
  Added test for bug #9566 "explicit LOCK TABLE and store procedures result in illegal
  state"
mysql-test/t/sp.test:
  Added test for bug #9566 "explicit LOCK TABLE and store procedures result in illegal
  state"
sql/sp.cc:
  db_find_routine_aux():
    We should not assume that mysql.proc table does not exist if we are
    unable to open it under LOCK TABLES or in prelocked mode since this
    condition may be transient.