Remove release note file in wrong path

This patch removes the release note file which was added into wrong
path in an old commit[1].
The removed relesae note file is not added into releasenote directory
to avoid confusion by a note associated with wrong release.

[1] 0f617ce27a

Change-Id: I8ff8886b65a323a65dd0ff9d01066c82a4116f8d
(cherry picked from commit 064edacff3)

manifests/releasenotes/notes/rabbitmq-connection-params-1a8ace0c23e7249e.yaml

@@ -1,6 +0,0 @@
----
-deprecations:
-  - The rabbitmq connection paramters have been deprecated in favor of
-    transport_url which is provided by the oslo::messaging::default class.
-    This affects, rabbit_host, rabbit_port, rabbit_hosts, rabbit_userid,
-    rabbit_password and rabbit_virtual_host.