Remove filtering and add status outputs to stdout.
Remove filtering and add status outputs to stdout.

Pre-work for adding a filtering script. gtest_parallel.py now outputs
test executable as well as test being run and also an exit code when a
subprocess finishes.

bbannier/gtest-parallel,greggomann/gtest-parallel,google/gtest-parallel,kwiberg/gtest-parallel,ehlemur/gtest-parallel,pbos/gtest-parallel