[Libguestfs] virt-builder and Ubuntu 16.04 Xenial no access issue

[P J P]

+-- On Fri, 21 Oct 2016, Richard W.M. Jones wrote --+
| I added a regression test which tests password changing:
| https://github.com/libguestfs/libguestfs/commit/2f57eb181f5083c131c59da9c71dc354cc6070fe

  Okay, cool.
 
| If you have a reproducible case where password changing does not work for 
| you, then let us know.

  It was on the beaker machine, not anymore.

Thank you.
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 - P J P
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