golang/xenlight: fix code generation for python 2.6

Before python 2.7, str.format() calls required that the format fields
were explicitly enumerated, e.g.:

  '{0} {1}'.format(foo, bar)

  vs.

  '{} {}'.format(foo, bar)

Currently, gengotypes.py uses the latter pattern everywhere, which means
the Go bindings do not build on python 2.6. Use the 2.6 syntax for
format() in order to support python 2.6 for now.

Signed-off-by: Nick Rosbrook <rosbrookn@ainfosec.com>
Acked-by: Wei Liu <wl@xen.org>
(cherry picked from commit 6d49fbd)