spec: replace scriptlets with new systemd macros

https://bugzilla.redhat.com/850186

I added %with_systemd_macros so it should now work in F17 with old
scriptlets and in F18+/RHEL7+ with systemd macros
(see https://fedoraproject.org/wiki/Packaging:ScriptletSnippets#Systemd)

I missed libvirt-guests.service because there is no systemctl call for
it. So I only added systemd macros calls.

libvirt.spec.in

@@ -319,6 +319,13 @@
 %define with_rhel5  0
 %endif
 
+%if 0%{?fedora} >= 18 || 0%{?rhel} >= 7
+%define with_systemd_macros 1
+%else
+%define with_systemd_macros 0
+%endif
+
+
 Summary: Library providing a simple virtualization API
 Name: libvirt
 Version: @VERSION@
@@ -1465,10 +1472,14 @@ done
 %endif
 
 %if %{with_systemd}
+%if %{with_systemd_macros}
+%systemd_post libvirtd.service
+%else
 if [ $1 -eq 1 ] ; then
     # Initial installation
     /bin/systemctl enable libvirtd.service >/dev/null 2>&1 || :
 fi
+%endif
 %else
 %if %{with_cgconfig}
 # Starting with Fedora 16/RHEL-7, systemd automounts all cgroups,
@@ -1488,11 +1499,15 @@ fi
 
 %preun daemon
 %if %{with_systemd}
+%if %{with_systemd_macros}
+%systemd_preun libvirtd.service
+%else
 if [ $1 -eq 0 ] ; then
     # Package removal, not upgrade
     /bin/systemctl --no-reload disable libvirtd.service > /dev/null 2>&1 || :
     /bin/systemctl stop libvirtd.service > /dev/null 2>&1 || :
 fi
+%endif
 %else
 if [ $1 = 0 ]; then
     /sbin/service libvirtd stop 1>/dev/null 2>&1
@@ -1502,12 +1517,16 @@ fi
 
 %postun daemon
 %if %{with_systemd}
+%if %{with_systemd_macros}
+%systemd_postun_with_restart libvirtd.service
+%else
 /bin/systemctl daemon-reload >/dev/null 2>&1 || :
 if [ $1 -ge 1 ] ; then
     # Package upgrade, not uninstall
     /bin/systemctl try-restart libvirtd.service >/dev/null 2>&1 || :
 fi
 %endif
+%endif
 
 %if %{with_network}
 %post daemon-config-network
@@ -1538,6 +1557,9 @@ fi
 %preun client
 
 %if %{with_systemd}
+%if %{with_systemd_macros}
+%systemd_preun libvirt-guests.service
+%endif
 %else
 if [ $1 = 0 ]; then
     /sbin/chkconfig --del libvirt-guests
@@ -1549,6 +1571,9 @@ fi
 
 /sbin/ldconfig
 %if %{with_systemd}
+%if %{with_systemd_macros}
+%systemd_post libvirt-guests.service
+%endif
 %else
 /sbin/chkconfig --add libvirt-guests
 %endif
@@ -1556,6 +1581,9 @@ fi
 %postun client -p /sbin/ldconfig
 
 %if %{with_systemd}
+%if %{with_systemd_macros}
+%systemd_postun_with_restart libvirt-guests.service
+%endif
 %triggerun client -- libvirt < 0.9.4
 %{_bindir}/systemd-sysv-convert --save libvirt-guests >/dev/null 2>&1 ||: