Update other references to AGPL-3.0 license, DCO, CONTRIBUTING

Author: computate

CONTRIBUTING

@@ -0,0 +1,7 @@
+Certificate of Origin
+^^^^^^^^^^^^^^^^^^^^^
+
+By contributing to this project you agree to the Developer Certificate of
+Origin (DCO). This document was created by the Linux Kernel community and is a
+simple statement that you, as a contributor, have the legal right to make the
+contribution. See the `DCO <DCO>`_ file for details.

DCO

@@ -0,0 +1,37 @@
+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+1 Letterman Drive
+Suite D4700
+San Francisco, CA, 94129
+
+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.

pom.xml

@@ -67,8 +67,8 @@
 
   <licenses>
     <license>
-      <name>GNU GENERAL PUBLIC LICENSE, Version 3</name>
-      <url>https://www.gnu.org/licenses/gpl-3.0.en.html</url>
+      <name>GNU AFFERO GENERAL PUBLIC LICENSE</name>
+      <url>https://www.gnu.org/licenses/agpl-3.0.html</url>
     </license>
   </licenses>