tools/test.py should be able to get a full path to a test to manually run it

Currently if you want to manually run a test you have to remove test/ from the beginning of the path and not include the js prefix.

For example the following commands will not work

$ python tools/test.py test/parallel/test-cluster-worker-init.js
$ python tools/test.py test/parallel/test-cluster-worker-init
$ python tools/test.py parallel/test-cluster-worker-init.js

but the following will

$ python tools/test.py parallel/test-cluster-worker-init

I find this counter intuitive and would like the ability to pass the full path to a test

/cc @nodejs/build @jbergstroem do you oppose to this being done?