Cleans up the output of run_tests.sh to look closer to Trial.

Example output:

VolumeTestCase
    test_concurrent_volumes_get_different_targets               ok
    test_create_delete_volume                                   ok
    test_multi_node                                             ok
    test_run_attach_detach_volume                               ok
    test_too_big_volume                                         ok
    test_too_many_volumes                                       ok
XenAPIVMTestCase
    test_list_instances_0                                       ok
    test_spawn                                                  ok
XenAPIVolumeTestCase
    test_attach_volume                                          ok
    test_attach_volume_raise_exception                          ok
    test_create_iscsi_storage                                   ok
    test_parse_volume_info_raise_exception                      ok

----------------------------------------------------------------------
Ran 232 tests in 82.677s

Launchpad is removing a bunch of spaces from the output, but the 'ok' parts are all lined up in the 65th column