spec: Don't save/restore running VMs on libvirt-client update

Restarting an active libvirt-guests.service is the equivalent of
doing:

/usr/libexec/libvirt-guests.sh stop
/usr/libexec/libvirt-guests.sh start

Which in a default configuration will managedsave every running VM,
and then restore them. Certainly not something we should do every
time the libvirt-client RPM is updated.

Just drop the try-restart attempt, I don't know what purpose it
serves anyways.

https://bugzilla.redhat.com/show_bug.cgi?id=962225

libvirt.spec.in

@@ -1714,9 +1714,8 @@ fi
 # If the package is allowed to autostart:
 /bin/systemctl --no-reload enable libvirt-guests.service >/dev/null 2>&1 ||:
 
-# Run these because the SysV package being removed won't do them
+# Run this because the SysV package being removed won't do them
 /sbin/chkconfig --del libvirt-guests >/dev/null 2>&1 || :
-/bin/systemctl try-restart libvirt-guests.service >/dev/null 2>&1 || :
 %endif
 
 %if %{with_sanlock}