Always sync the database before triggering a host reboot.

Failing to do this can undo all the network and SR configuration.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>
Tell the user to re-run the wizard after the reboot

Some actions need to be performed after the reboot. It's always safe to
re-run the wizard to check.

Signed-off-by: David Scott <dave.scott@eu.citrix.com>