LP:683112 - Maria 5.2 incorrectly reports "(using password: NO)" even when password is specified

Maria 5.2 incorrectly reports "(using password: NO)" on unsuccessfull connection attempts, even if password was specified. Maria 5.1 and mysql 5.1 are not affected.

To repeat:

cd mysql-test
MTR_VERSION=1 perl mysql-test-run.pl --start-and-exit 1st

mysql -ufoo --protocol=tcp --port=9306 -pbar

ERROR 1045 (28000): Access denied for user 'foo'@'localhost' (using password: NO)

The message comes from the server. The issue is also reproducible without the mysql client by using a connector.

Such a regression would cause issues for people trying to debug authentication failures. It also causes various PHP connector tests to fail.