Backporting to stretch: OpenSSL versions mix

[wferi at niif.hu]

Etienne Dysli Metref <etienne.dysli-metref at switch.ch> writes:

> Nevertheless, I've attempted to revert shibboleth-sp back to level 9
> then upgrade to 10 on branch edm/debian/stretch-backports (5cc57c19),
> while reading debhelper's levels changelog [1]. Given my inexperience
> with this, I've probably missed something. Let me know what you think.

I think we should wait for the backport of init-system-helpers being
accepted.  More precisely, we needn't wait for it, since our packages
already build fine with debhelper compat 12, so they could as well wait
together.
-- 
Regards,
Feri