Simplify manual broker creation

[matzew]

Problem
While creating the default broker is pretty easy (via injection), doing a manual setup is pretty hard, and requires some manual steps:

https://github.com/knative/docs/blob/master/docs/eventing/broker-trigger.md#manual-setup

However, most of this could be done for the user, so that they could just do

k apply -f my-own-broker.yaml

Now, when reconciling any Broker, the broker reconciler sets the required RBAC

Persona:

• Event Consumer
• Event Producer
• System Integratior

Exit Criteria
A measurable (binary) test that would indicate that the problem has been resolved.

[akashrv]

/milestone v0.11.0

[lionelvillard]

This is relevant for multi-tenant systems, as well as DLC support.

/milestone v0.12.0

[knative-prow-robot]

@lionelvillard: You must be a member of the knative/knative-milestone-maintainers GitHub team to set the milestone. If you believe you should be able to issue the /milestone command, please contact your and have them propose you as an additional delegate for this responsibility.

Details

In response to this:

This is relevant for multi-tenant systems, as well as DLC support.

/milestone v0.12.0

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