specfile: Remove %pre section

We have been using the systemd RPM macro `tmpfiles_create_package`
incorrectly. Since the entries in `tmpfiles.d` and `sysusers.d` are
not prerequisites for installation, https://src.fedoraproject.org/rpms/systemd/blob/master/f/triggers.systemd#_68
should be sufficient to ensure that the necessary tmpfiles and users
are created post installation.

rust-zincati.spec

@@ -6,7 +6,7 @@
 
 Name:           rust-%{crate}
 Version:        0.0.12
-Release:        5%{?dist}
+Release:        6%{?dist}
 Summary:        Update agent for Fedora CoreOS
 
 # Upstream license specification: Apache-2.0
@@ -69,10 +69,6 @@ License:        ASL 2.0 and BSD and MIT and MPLv2.0 and zlib
 %{_tmpfilesdir}/zincati.conf
 %{_datadir}/polkit-1/rules.d/zincati.rules
 
-%pre         -n %{crate}
-%sysusers_create_package %{crate} 50-zincati.conf
-%tmpfiles_create_package %{crate} zincati.conf
-
 %post        -n %{crate}
 %systemd_post zincati.service
 
@@ -123,6 +119,9 @@ ln -snf /run/%{crate}/public/metrics.promsock %{buildroot}/run/%{crate}/private/
 %endif
 
 %changelog
+* Wed Sep 23 2020 Kelvin Fan <kfan@redhat.com> - 0.0.12-6
+- Remove unnecessary usage of systemd RPM macro in %pre
+
 * Sun Aug 16 15:01:58 GMT 2020 Igor Raits <ignatenkobrain@fedoraproject.org> - 0.0.12-5
 - Rebuild