Retire devstack-plugin-pika project

This plugin was used by the oslo.messaging project to test the
development of an alternative RabbitMQ message driver based on
the Pika library (instead of the default Kombu driver).

Development of this driver was dropped in Queens and is not
supported.

Depends-On: https://review.opendev.org/#/c/748698/
Change-Id: I5ca41e3d1d55f0ea54dc783d62f37903dcd99c2e

gerrit/projects.yaml

@@ -2888,8 +2888,8 @@
 - project: openstack/devstack-plugin-open-cas
   description: DevStack plugin to configure open-cas.
 - project: openstack/devstack-plugin-pika
-  description: DevStack plugin to configure Pika RabbitMQ driver.
-  acl-config: /home/gerrit2/acls/openstack/oslo.messaging.config
+  description: RETIRED, DevStack plugin to configure Pika RabbitMQ driver.
+  acl-config: /home/gerrit2/acls/openstack/retired.config
 - project: openstack/devstack-plugin-zmq
   description: RETIRED, DevStack plugin to configure ZMQ.
   acl-config: /home/gerrit2/acls/openstack/retired.config

gerritbot/channels.yaml

@@ -1057,7 +1057,6 @@ openstack-oslo:
     - openstack/debtcollector
     - openstack/devstack-plugin-amqp1
     - openstack/devstack-plugin-kafka
-    - openstack/devstack-plugin-pika
     - openstack/etcd3gw
     - openstack/futurist
     - openstack/openstack-doc-tools

zuul.d/projects.yaml

@@ -2408,12 +2408,6 @@
     templates:
       - official-openstack-repo-jobs
 
-- project:
-    name: openstack/devstack-plugin-pika
-    templates:
-      - official-openstack-repo-jobs
-      - noop-jobs
-
 - project:
     name: openstack/devstack-tools
     templates:

zuul/main.yaml

@@ -445,7 +445,6 @@
           - openstack/devstack-plugin-kafka
           - openstack/devstack-plugin-nfs
           - openstack/devstack-plugin-open-cas
-          - openstack/devstack-plugin-pika
           - openstack/devstack-tools
           - openstack/devstack-vagrant
           - openstack/dib-utils