put cache killer right before restart operation

sysv restart

OBS-URL: https://build.opensuse.org/package/show/network:ldap/sssd?expand=0&rev=123

sssd.spec

@@ -397,8 +397,6 @@ rm -Rf "$b/%_sysconfdir/dbus-1" "$b/%_datadir/dbus-1"
 %if 0%{?_unitdir:1}
 %service_add_post sssd.service
 %endif
-# Clear caches, which may have an incompatible format after (especially) downgrade
-rm -f /var/lib/sss/db/*.ldb
 
 %if 0%{?_unitdir:1}
 %preun
@@ -411,8 +409,15 @@ if [ "$1" == "0" ]; then
 fi;
 /sbin/ldconfig
 %if 0%{?_unitdir:1}
+# Clear caches, which may have an incompatible format afterwards
+# (especially, downgrades)
+rm -f /var/lib/sss/db/*.ldb
+# del_postun includes a try-restart
 %service_del_postun sssd.service
+%else
+%restart_on_update sssd
 %endif
+%insserv_cleanup
 
 %post   -n libipa_hbac0 -p /sbin/ldconfig
 %postun -n libipa_hbac0 -p /sbin/ldconfig