Remove MPL Exhibit B, the lib is dual-licensed

Author: acogoluegnes

LICENSE-MPL-RabbitMQ

@@ -364,10 +364,4 @@ file, then You may include the notice in a location (such as a LICENSE
 file in a relevant directory) where a recipient would be likely to look
 for such a notice.
 
-You may add additional accurate notices of copyright ownership.
-
-Exhibit B - "Incompatible With Secondary Licenses" Notice
----------------------------------------------------------
-
-  This Source Code Form is "Incompatible With Secondary Licenses", as
-  defined by the Mozilla Public License, v. 2.0.
+Copyright (c) 2007-2020 VMware, Inc. or its affiliates.