[4/7] msi: Add package validation tests.

[testbot at testbot.winehq.org]

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
http://testbot.winehq.org/JobDetails.pl?Key=5898

Your paranoid android.


=== W7PROX64 (64 bit install) ===
install.c:10164: Test failed: key not removed
install.c:10174: Test failed: key not removed
install.c:10185: Test failed: key not removed
install.c:10476: Test failed: key not created