Switch project contribution process from CLA to DCO

[timkpaine]

We are planning to adopt DCO (Developer Certificate of Origin) instead of CLA as the mechanism for authorizing project contributions. More information is available about the differences between these two on the FINOS Open Source Readiness website.

There are no changes to the licensing or the copyright ownership for this project.

Changes are planned for early next week, a PR to the contributing documentation will follow shortly. We will be turning off the CLA enforcement bot and turning on a DCO enforcement bot. Subsequent contributions will need to be signed.

This issue is to provide notice, please provide any comments, questions, or concerns below.

@texodus @sc1f @timkpaine

[brianblakely]

Do you know if contributors who are already authorized under the CLA will need to be re-authorized under DCO?

[timkpaine]

@brianblakely nope, there is no retroactive change necessary. Only effects future changes.