Add /etc/ssh/sshd_config.d to the file list
This is a bit of a mess: sshd can only load configuration from
/etc/ssh/sshd_config.d, and that directory is declared as non-world-readable.
This is in violation of the packaging guidelines which say that packaged files
must be world-readable, and also makes very little sense, since those files
are part of the package payload.
If we create the directory with different permissions, and list it in %files,
installation will fail. If we don't list it in %files, and the user doesn't have
openssh-server installed, they will have an unowned directory. Another option
would be to depend on owner of this directory, i.e. openssh-server, but we don't
want to have that dependency. So let's copy the %files line from openssh-server
and figure out what to do if it changes in openssh-server again.
(cherry picked from commit 245a2587e095a08a61af4e48f7daa57dee3629e6)