Libvirt starting commands

Libvirt starting commands for systemd and init.d added.

docs/getting-started-guides/libvirt-coreos.md

@@ -86,8 +86,8 @@ On the other hand, `libvirt-coreos` might be useful for people investigating low
 4. Install [libvirt](http://libvirt.org/)
 5. Install [openssl](http://openssl.org/)
 6. Enable and start the libvirt daemon, e.g:
-   * ``systemctl enable libvirtd``
-   * ``systemctl start libvirtd``
+   * ``systemctl enable libvirtd && systemctl start libvirtd`` # for systemd-based systems
+   * ``/etc/init.d/libvirt-bin start`` # for init.d-based systems
 7. [Grant libvirt access to your user¹](https://libvirt.org/aclpolkit.html)
 8. Check that your $HOME is accessible to the qemu user²