v2.1.9.RELEASE

Change log:

1cbe7fb (HEAD -> 2.1.x) Upgrade to Jackson 2.9.9.20190807
3ebe831 GH-1074: Admin explicitDeclarationsOnly Property
37a466a GH-1062: Fix missing queues log message
2d4c3c0 GH-1065: Reject fatal with MANUAL ack mode