Downgrade a couple of warnings to debug

Downgrade a couple of warnings to debug

If a package still ships only a SysV init script or if a service file or
tmpfile uses /var/run, downgrade those messages to debug. We can use
lintian to detect those issues.
For service files and tmpfiles in /etc, keep the warning, as those files
are typically added locally and aren't checked by lintian.

Closes: #981407
Gbp-Pq: Topic debian
Gbp-Pq: Name Downgrade-a-couple-of-warnings-to-debug.patch