Do some cleaning up of the testsuite driver

When trying to understand the GHC test suite I noticed some small improvements that I could do to it. This would probably work nicely as my first task on GHC:

Rewrite the timeout.hs in python, it is used for Windows runs but it doesn't seem to do anything that would strictly need the Haskell libraries to be used and it is the only part of the test suite driver that is not written in python.

Or;

See if the timeout scripts could be eliminated altogether as the python subprocess module that we are using can now (since python 3.3) handle timeouts by itself and using the timeout scripts effectively doubles the number of processes we need to create for each test case. Notice that the timeout scripts do more than just generating the timeout.