database after failing to execute a stored procedure in an inaccessible
database. (Bug #12318)


mysql-test/r/sp-security.result:
  Update results
mysql-test/t/sp-security.test:
  Add regression test
sql/mysql_priv.h:
  Add additional argument to mysql_change_db()
sql/sp.cc:
  Use mysql_change_db(), get rid of sp_change_db().
sql/sp.h:
  Get rid of sp_change_db().
sql/sql_db.cc:
  Handle no_access_check flag to mysql_change_db, and remove the send_ok()
  call.
sql/sql_parse.cc:
  Add extra argument to mysql_change_db(), and call send_ok() after
  successful calls to same (since it no longer does it for us).