Christian Ehrhardt authored Oct 16, 2017 and Ondrej Sury committed Dec 11, 2017

New tests were added along work for but those are still failing on
s390x. To pass dep8, but not skip on unittests entirely this disables
the particular test on s390x.

[1]: https://jira.mariadb.org/browse/MDEV-13412



Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
(cherry picked from commit 34222e24)