The rewrite refactors the suite to use the new style along with
other recent testing improvements. In order to ensure the spread
tests do not impact each other, there is new cleanup functionality
to ensure both the job and allocations are removed from state
before the test exits completely.
The spread test is infrequently flaky and it's hard to extract what's actually
happening. If the test fails, dump all the allocation metrics so that we can
debug the behavior.
* Adds a constraint to prevent tests from landing on Windows
* Improve Terraform output for mixed windows/linux clients
* Makes some Windows client config fixes from 0.10.2 testing
