Add drop-TestUnicodeDocString.patch as the test fails with pytest
A new upstream test fails to run successfully when tested with pytest [1]. This doesn't fail during build as during build only nose/nose2 is tested. I tried to see if I could understand why it fails, but something inside is really wrong as it seems that 2 parameterizations cause the test to run 3 times and that fails during cleanup on the third. I played around with different parameters, and also removed the doc string, but all permutations to no avail.
Instead of removing autopkgtest, let's only remove the failing test.
[1] Upstream: https://github.com/wolever/parameterized/issues/122
Closes: #995356
