Upgrade RabbitMQ to 3.8

Registered by Dincer Celik

As discussed at PTG on Nov 7-8, RabbitMQ upgrade from 3.7 to 3.8 would be a good improvement for Kolla.

RabbitMQ 3.8 ships with some major features like:

1. Quorum queues
2. Feature flags
3. Built-in Prometheus exporter

You should check release notes[1] for more details.

1. https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.8.0

Blueprint information

Status:
Complete
Approver:
None
Priority:
Medium
Drafter:
Dincer Celik
Direction:
Needs approval
Assignee:
Dincer Celik
Definition:
Approved
Series goal:
Proposed for ussuri
Implementation:
Implemented
Milestone target:
milestone icon 10.0.0
Started by
Dincer Celik
Completed by
Dincer Celik

Related branches

Sprints

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(?)

Work Items

Work items:
Ubuntu Bionic: DONE
Debian Buster: DONE
CentOS 7: DONE
CentOS 8: TODO
x86_64: DONE
aarch64: DONE
ppc64le: TODO

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