Improve event streaming with a better Octavia verison

In a newer Octavia version we can specify the transport_url for
the event streamer which listens on the neutron rabbit vhost.
This configures that and also enables provisonal status streaming by
default.

Depends-On: I00422b93d3ecfb672e967c2019424b64bc44ba66

Change-Id: I8bee145d5517c66c95bb24ba62cf6f7ed497df2d

defaults/main.yml

@@ -277,7 +277,22 @@ octavia_task_flow_max_workers: 5
 octavia_event_streamer: True
 
 # Enable provisioning status sync with neutron db
-octavia_sync_provisioning_status: False
+octavia_sync_provisioning_status: True
+
+# OSA is architected to use vHosts for queues so we need to post events
+# into the Neutron queue for them to be picked up
+neutron_rabbitmq_userid: neutron
+neutron_rabbitmq_vhost: /neutron
+neutron_rabbitmq_port: 5672
+neutron_rabbitmq_servers: 127.0.0.1
+neutron_rabbitmq_use_ssl: False
+neutron_rabbitmq_password: changeme
+
+# For additional security use a different user on the Neutron queue
+# for Octavia with restricted access to only the event streamer
+# queues
+octavia_neutron_rabbitmq_userid: "{{ neutron_rabbitmq_userid }}"
+octavia_neutron_rabbitmq_password: "{{ neutron_rabbitmq_password }}"
 
 # this controls if Octavia should add an anti-affinity hint to make sure
 # two amphora are not placed pn the same host (the most common setup of

releasenotes/notes/custom_eventstreamer_queue_url-a1dcd1f6769816c5.yaml

@@ -0,0 +1,16 @@
+---
+features:
+  - |
+    A typical OSA install will put the neutron and octavia queues on different
+    vhosts thus preventing the event streamer from working While Octavis is
+    streaming to its own queue the consumer on the neutron side listens to the
+    neutron queue. With a recent Octavia enhancement a separate queue for the
+    event streamer can be configured. This patch will set up the event streamer
+    to post into the neutron queue using neutron's credentials. Thus reaching
+    the consumer on the neutron-lbaas side and allowing for streaming.
+security:
+  - |
+    Since we use neutron's credentials to access the queue, security conscious
+    people might want to set up an extra user for octavia on the neutron queue
+    restricted to the topics octavia posts to.
+

templates/octavia.conf.j2

@@ -238,6 +238,12 @@ topic = octavia_prov
 # Topic for octavia's events sent to a queue
 event_stream_topic = neutron_lbaas_event
 
+# Put it into the Neutron queue
+{% if octavia_event_streamer|bool %}
+event_stream_transport_url = rabbit://{% for host in neutron_rabbitmq_servers.split(',') %}{{ octavia_neutron_rabbitmq_userid }}:{{ octavia_neutron_rabbitmq_password }}@{{ host }}:{{ neutron_rabbitmq_port }}{% if not loop.last %},{% else %}/{{ neutron_rabbitmq_vhost }}{% endif %}{% endfor %}
+{% endif %}
+
+
 [house_keeping]
 # Interval in seconds to initiate spare amphora checks
 # spare_check_interval = 30