fix: rename dracut.conf.d .conf files to conf.example

Sadly, dracut.conf.d.*.conf files will be also picked up
during CI test runs and there is no trivial way to disable
that, so let's follow the existing .example pattern until
there is a better solution.

diff --git a/dracut.conf.d/50-fips.conf b/dracut.conf.d/50-fips.conf.example
similarity index 100%
rename from dracut.conf.d/50-fips.conf
rename to dracut.conf.d/50-fips.conf.example

diff --git a/dracut.conf.d/50-generic.conf b/dracut.conf.d/50-generic.conf.example
similarity index 100%
rename from dracut.conf.d/50-generic.conf
rename to dracut.conf.d/50-generic.conf.example

diff --git a/dracut.conf.d/50-hostonly.conf b/dracut.conf.d/50-hostonly.conf.example
similarity index 100%
rename from dracut.conf.d/50-hostonly.conf
rename to dracut.conf.d/50-hostonly.conf.example

diff --git a/dracut.conf.d/50-rescue.conf b/dracut.conf.d/50-rescue.conf.example
similarity index 100%
rename from dracut.conf.d/50-rescue.conf
rename to dracut.conf.d/50-rescue.conf.example