Reboot to start Xen before we configure services

Signed-off-by: David Scott <dave.scott@citrix.com>
Touch /var/xenserver/trigger-wizard to run the wizard after boot

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #65 from djs55/reboot-early

Reboot to Xen before running xapi et al