Blacklist spec-cleaner 1.0.8 due to libexecdir regression
Blacklist spec-cleaner 1.0.8 due to libexecdir regression

https://github.com/openSUSE/spec-cleaner/issues/232 points out
that 1.0.8 is bad, we need to skip it for now until the problem
is solved.

Depends-On: https://review.openstack.org/#/c/569888/
Change-Id: I69e5cafa9cbefbf51fda7412c5f495651e8bfad3

openstack/rpm-packaging,openstack/rpm-packaging