Remove ancient file test/test.py

It doesn't even contains tests. I guess this is from pre-nosetests time.

    $ LUIGI_CONFIG_PATH=test/testconfig/client.cfg HADOOP_HOME=cdh ./scripts/ci/run_tests.sh test/test.py
    Using  distribution of Hadoop from cdh

    ----------------------------------------------------------------------
    Ran 0 tests in 0.000s

    OK
Merge pull request #527 from Tarrasch/remove_ancient_test

Remove ancient file test/test.py