tests: unhide shunit2 test failures

[wififreedom]

Fix for issue #21

shunit2 test with failing subtest incorrectly produced:

      Start 2: shunit2
  2/2 Test #2: shunit2 ..........................   Passed   52.70 sec

  100% tests passed, 0 tests failed out of 2

now correctly produces:

      Start 2: shunit2
  2/2 Test #2: shunit2 ..........................***Failed   53.68 sec
  #
  # Performing tests
  #
  ...
  test_get_option
  ASSERT:expected:<badval> but was:<val>
  test_get_option_multiline
  ...

  #
  # Test report
  #
  tests passed:   111  99%
  tests failed:     1   1%
  tests skipped:    0   0%
  tests total:    112 100%

  50% tests passed, 1 tests failed out of 2

  Total Test time (real) =  59.67 sec

  The following tests FAILED:
        2 - shunit2 (Failed)
  Errors while running CTest
  make: *** [Makefile:74: test] Error 8
  make: Leaving directory '/home/user/repos/uci/build'