- Use _unitdir macro instead asking pkg config of systemd

- Fix License: Even https://spdx.org/licenses/Sendmail.html lists
"Sendmail" as the valid identifier. Same as
http://license.opensuse.org/ does. "Sendmail License" is in the
column "Full Name". The License: tag requires the identifier.
- Fix some more rpmlint warnings:
+ sendmail: W: suse-missing-rclink sendmail:
- Ship /usr/sbin/rcsendmail symlink to /usr/sbin/service
+ sendmail: W: suse-missing-rclink sendmail-client
- Ship /usr/sbin/rcsendmail-client symlink to /usr/sbin/service
+ sendmail: W: suse-wrong-suse-capitalisation:
- Rename README.SuSE to README.SUSE (fix spelling also inside
the file).
+ sendmail: W: permissions-dir-without-slash
- Fix permissions and permissions.paranoid inside
sendmail-suse.tar.bz2.
+ sendmail: W: systemd-service-without-service_del_postun:
- Add corresponding macros to postun script when not building
with sysvinit support.
+ sendmail: W: systemd-service-without-service_add_pre:
- Add corresponding macros to pre script when not building
with sysvinit support.

- Drop unused patch:
* sendmail-8.14.7-warning.patch

- Split uucp to separate package, no technical reason for it to not
stand on its own
- Drop uucp related patches: