[1/2] services/tests: Add test for database locking.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=29411

Your paranoid android.


=== w7u (32 bit service) ===
service.c:407: Test failed: LockServiceDatabase failed: 1055
service.c:413: Test failed: UnlockServiceDatabase failed: 1071