[Fuego] Fuego license and contribution policy

[Tim.Bird at sony.com]

Hey everyone,

I finally got around to documenting Fuego official license
and contribution policy.  Here is a link to the online docs:

http://fuegotest.org/wiki/License_And_Contribution_Policy

Because this is important, I'm going to include the full text from the
wiki page below.  We've been using Signed-off-by lines in our commits.
So I think most developers understand the underlying principles here
(and that we were using the Linux kernel DCO).  But this document
makes it official.

Please let me know if you have any questions or comments.
 -- Tim

-----
Fuego has the following license policy.

Fuego consists of several parts, and includes source code from
a number of different external test projects.

= Default license =
The default license for Fuego is the BSD 3-Clause license, as
indicated in the LICENSE file at the top of the 'fuego' and
'fuego-core' source repositories.

If a file does not have an explicit license, or license indicator
(such as SPDX identifier) in the file, than that file is
covered by the default license for the project, with the exceptions
noted below for "external test materials".

When making contributions, if you do NOT indicate an alternative
license for your contribution, the contribution will be assigned
the license of the file to which the contribution applies (which
may be the default license, if the file contains no existing
license indicator).

Although we may allow for other licenses within the Fuego project
in order to accommodate external software added to our system, our
preference is to avoid the proliferation of licenses in the Fuego
code itself.

== external test materials =
Individual tests in Fuego consist of files in the directory:
engine/tests/<test_name> (which is known as the test home directory),
and may include two types of materials:
 * 1) Fuego-specific files
 * 2) files obtained from external sources, which have their own license.

The Fuego-specific materials consist of files such as:
fuego_test.sh, spec.json, reference.json, test.yaml, chart_config.json,
and possibly others as created for us in the Fuego project.
External test materials may consist of tar files, helper scripts
and patches against the source in the tar files.

Unless otherwise indicated, the Fuego-specific materials are
licensed under the Fuego default license, and the external test
materials are licensed under their own individual project
license - as indicated in the test source.

In some cases, there is no external source code, but only source
that is originally written for Fuego and stored in the test
home directory. This commonly includes tests based on a single
shell script, that is written to be deployed to the Device Under
Test by fuego_test.sh.  Unless otherwise indicated, these files
(source and scripts) are licensed under the Fuego default license.

If there is any ambiguity in the category of a particular file
(external or Fuego-specific), please designate the intended license
clearly in the file itself, when making a contribution.

= Copyright statements =
Copyrights for individual contributions should be added to
individual files, when the contributions warrant copyright
assignment.  Some trivial fixes to existing code may not need
to have copyright assignment, and thus not every change to a file
needs to include a copyright notice for the contributor.

= Contributor agreement =
The Fuego project does not require a signed Contributor License
Agreement for contribution to the project. Instead, we utilize
the following Developer Certificate of Origin that was copied
from the Linux kernel.

Each contribution to Fuego must be accompanied by a
Signed-off-by line in the patch or commit description, which
indicates agreement to the following:

{{{#!YellowBox
By making a contribution to this project, I certify that:

        (a) The contribution was created in whole or in part by me and I
            have the right to submit it under the open source license
            indicated in the file; or

        (b) The contribution is based upon previous work that, to the best
            of my knowledge, is covered under an appropriate open source
            license and I have the right under that license to submit that
            work with modifications, whether created in whole or in part
            by me, under the same open source license (unless I am
            permitted to submit under a different license), as indicated
            in the file; or

        (c) The contribution was provided directly to me by some other
            person who certified (a), (b) or (c) and I have not modified
            it.

        (d) I understand and agree that this project and the contribution
            are public and that a record of the contribution (including all
            personal information I submit with it, including my sign-off) is
            maintained indefinitely and may be redistributed consistent with
            this project or the open source license(s) involved.
}}}

''Note: Please note that an "official" DCO at the web site
https://developercertificate.org/ has additional text
(an LF copyright, address, and statement of non-copyability).
All of these are either nonsense or problematical in some legal
sense. The above is a quote of a portion of the document found
in the Linux kernel guide for submitting patches.  See
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst (copied in March, 2018).''

Each commit must include a DCO which looks like this

{{{
   Signed-off-by: Joe Smith <joe.smith at email.com>
}}}

The project requires that the name used is your real name. Neither
anonymous contributors nor those utilizing pseudonyms will be accepted.

You may type this line on your own when writing your commit messages.
However, Git makes it easy to add this line to your commit messages.
Make sure the user.name and user.email are set in your git configs.
Use '-s' or '--signoff'
options to 'git commit' to add the Signed-off-by line to the end of
the commit message.