msi/tests: Move test coverage for standard actions to a separate module.

[Hans Leidekker]

This is to get rid of the remaining timeouts on testbot. We now have
a clean test run:

http://testbot.winehq.org/JobDetails.pl?Key=6167

On platforms where we need to create a restore point the install tests
still take over two minutes, so depending on the load on testbot we
might still see some timeouts.