Supported Distributions in diskimage-builder

[alan hoang]

I wonder if DIB support Ubuntu 16. Because I can build some Image (Ubuntu, CentOS) successfully on Ubuntu 16 host.

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-----------------------------------
Release: 2.9.1.dev62 on 2018-01-09 00:48
SHA: acc44c06519f0cd591e9149bf0ac96454a605f26
Source: https://git.openstack.org/cgit/openstack/diskimage-builder/tree/doc/source/user_guide/supported_distros.rst
URL: https://docs.openstack.org/diskimage-builder/latest/user_guide/supported_distros.html