libxl: move xen-init-dom0 to tools/helpers

Move xen-init-dom0 from tools/libxl to tools/helpers, as it is just a
helper program.

Signed-off-by: Juergen Gross <jgross@suse.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

.gitignore

@@ -134,6 +134,7 @@ tools/flask/utils/flask-setenforce
 tools/flask/utils/flask-set-bool
 tools/flask/utils/flask-label-pci
 tools/helpers/init-xenstore-domain
+tools/helpers/xen-init-dom0
 tools/hotplug/common/hotplugpath.sh
 tools/hotplug/FreeBSD/rc.d/xencommons
 tools/hotplug/FreeBSD/rc.d/xendriverdomain
@@ -301,7 +302,6 @@ tools/libxl/*.pyc
 tools/libxl/libxl-save-helper
 tools/libxl/test_timedereg
 tools/libxl/test_fdderegrace
-tools/libxl/xen-init-dom0
 tools/blktap2/control/tap-ctl
 tools/firmware/etherboot/eb-roms.h
 tools/firmware/etherboot/gpxe-git-snapshot.tar.gz