Fixed Kafka disconnection issue

[slinkydeveloper]

Signed-off-by: Francesco Guardiani [email protected]

Fixes #999

Proposed Changes

• Wrapped Consume method invocation in a loop, like explained in the example here: https://godoc.org/github.com/Shopify/sarama#ConsumerGroup

[lberk]

@slinkydeveloper looks like this change (as-is) causes a data race?

[slinkydeveloper]

@slinkydeveloper looks like this change (as-is) causes a data race?

Yep i'm investigating, doesn't seem a funny one

[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-eventing-contrib-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
kafka/common/pkg/kafka/consumer_factory.go	100.0%	90.3%	-9.7

[slinkydeveloper]

/retest

[matzew]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[guimou]

Thanks a lot guys! That will really help as otherwise the solution was not reliable enough to work with. :-)