CONTRIBUTING.md: replace CLA with DCO

The goal to enable more contributions was to replace the CLA with
something more light weight, embrace the DCO as its standard practice
in Linux and other projects.

Signed-off-by: Luis Chamberlain <[email protected]>

Author: mcgrof

CONTRIBUTING.md

@@ -10,13 +10,6 @@ We actively welcome your pull requests.
 3. If you've changed APIs, update the documentation.
 4. Ensure the test suite passes.
 5. Make sure your code lints.
-6. If you haven't already, complete the Contributor License Agreement ("CLA").
-
-## Contributor License Agreement ("CLA")
-In order to accept your pull request, we need you to submit a CLA. You only need
-to do this once to work on any of Meta's open source projects.
-
-Complete your CLA here: <https://code.facebook.com/cla>
 
 ## Issues
 We use GitHub issues to track public bugs. Please ensure your description is
@@ -34,3 +27,54 @@ outlined on that page and do not file a public issue.
 ## License
 By contributing to Kernel Patches Daemon, you agree that your contributions will be licensed
 under the LICENSE file in the root directory of this source tree.
+
+# Developer Certificate or Origin
+
+This project embraces the Developer Certificate of Origin (DCO) for
+contributions. This means you must agree to the following prior to submitting
+patches, if you agree with this developer certificate you acknowledge this by
+adding a Signed-off-by tag to your patch commit log. Every submitted patch
+must have this.
+
+The source for the DCO:
+
+http://developercertificate.org/
+
+-----------------------------------------------------------------------
+
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+660 York Street, Suite 102,
+San Francisco, CA 94110 USA
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+Developer's Certificate of Origin 1.1
+
+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.