added new gpg keys to cassandra and rabbitmq repos

Change-Id: Iac7c618d709852599add4c14374031fad3c97f6b
diff --git a/aptly/server/mirror/ubuntu/trusty/rabbitmq.yml b/aptly/server/mirror/ubuntu/trusty/rabbitmq.yml
index 5caa9b5..383aeda 100644
--- a/aptly/server/mirror/ubuntu/trusty/rabbitmq.yml
+++ b/aptly/server/mirror/ubuntu/trusty/rabbitmq.yml
@@ -4,6 +4,7 @@
     mirror_rabbitmq-testing-trusty_distribution: testing
     mirror_rabbitmq-testing-trusty_components: main
     mirror_rabbitmq-testing-trusty_gpgkeys:
+      - 6B73A36E6026DFCA
       - 056E8E56
   aptly:
     server: