spotify / luigi / 1886

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Performance fix in argparse interface

Instead of adding all global parameters to all subparsers (leading to a O(n^2) complexity where n is the number of tasks), just figure out the subparser that's needed and add it to that one

Running nosetests test/parameter_test.py:

Before: Ran 62 tests in 5.248s
After:  Ran 62 tests in 1.381s

Running nosetests -a '!minicluster':

Before: Ran 395 tests in 84.033s
After:  Ran 395 tests in 64.194s

7 of 7 new or added lines in 1 file covered. (100.0%)

3916 of 5038 relevant lines covered (77.73%)

3.42 hits per line