Migrate to junit 4.11 - failing test

Corrected test which caused problems in
https://git.opendaylight.org/gerrit/#/c/9670/

Change-Id: Ife89b83bbc1d2df4dc34327e5f27ed47509a8b48
Signed-off-by: Jozef Gloncak <jgloncak@cisco.com>