Eventing: Delete `knative-sources` namespace when upgrading to 0.6.0

[sebgoa]

With the move of CronJob sources to the main eventing controller, folks need to delete the knative-sources namespaces when then upgrade from 0.5.x to 0.6.0.

Otherwise we experience creation of multiple CronJob pods.

Deleting the namespace knative-sources got us back to a good working state with regards to cronjob sources.

[sebgoa]

So hold on this.

Looks like the error we saw was caused because eventing-sources was on a released version and we upgraded eventing to HEAD.

[n3wscott]

Yeah, no need to do this if you upgrade both components to 0.6.0

[n3wscott]

/close

[knative-prow-robot]

@n3wscott: Closing this issue.

In response to this:

/close

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[sebgoa]

sorry for the noise, but I can confirm if you keep eventing and eventing-sources in sync cronjob and the other sources work well.