This test has been dropped upstream[1] so no need to exclude it
during testing as this causes an unknown test failure.

[1] https://github.com/PyCQA/bandit/commit/e4da0b351f89a82b5de8dd791cbdd963476b5a11

Change-Id: Ib93abda1395e8a294b13da62f15ebc2c03963712