Feedlet doesn't start for ko.local

[sslavic]

Expected Behavior

Feeds can be materialized when Knative Eventing is installed via ko from sources

Actual Behavior

Feedlet container has Always pull policy so ko.local image cannot be resolved and Job fails

Steps to Reproduce the Problem

1. Install Knative Eventing from sources using ko (so not using Knative Eventing release yaml)
2. Install using ko github sample (it uses Feed)
3. Observe underlying Job status (it fails because Pod startup timeouts)

Additional Info

Probably Always should be changed to IfNotPresent in https://github.com/knative/eventing/blob/master/pkg/controller/feed/resources/job.go#L192

[inlined]

Fixed a demo fail I ran into today =/

[grantr]

/kind good-first-issue

[scothis]

Looks like a duplicate of #228