test: Remove known issue for kubectl exec failure
test: Remove known issue for kubectl exec failure

This update is now in the Fedora 23 images:

https://bodhi.fedoraproject.org/updates/FEDORA-2015-c7fa818f3f

Fixes #3012
Closes #3181
Reviewed-by: Marius Vollmer <bb11c6e942c5cc765df5f04da146b3198127a7a3@redhat.com>

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