[release-1.2] Prober targets service instead of pods directly

[aliok]

Manual cherry pick of #2159

Receiver's prober targets services instead of pods directly to allow components to be part of an Istio mesh

[pierDipi]

/lgtm

[knative-prow]

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Codecov Report

❗ No coverage uploaded for pull request base (release-1.2@a1d964e). Click here to learn what that means.
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@@              Coverage Diff               @@
##             release-1.2    #2180   +/-   ##
==============================================
  Coverage               ?   69.37%           
  Complexity             ?      618           
==============================================
  Files                  ?      131           
  Lines                  ?     5518           
  Branches               ?      180           
==============================================
  Hits                   ?     3828           
  Misses                 ?     1383           
  Partials               ?      307           

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java-unittests	81.98% <0.00%> (?)

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[aliok]

/test unit-tests_eventing-kafka-broker_release-1.2

(https://repo.maven.apache.org/maven2): transfer failed for https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-shade-plugin/3.2.1/maven-shade-plugin-3.2.1.pom: Connection reset -> [Help 1]

[pierDipi]

/test channel-reconciler-tests-ssl_eventing-kafka-broker_release-1.2

[aliok]

/test channel-reconciler-tests-ssl_eventing-kafka-broker_release-1.2

Doesn't look good :(

helpers.go:109: Failed to patch the ChannelImpl {error 26 0  Internal error occurred: failed calling webhook "validation.webhook.kafka.eventing.knative.dev": failed to call webhook: Post "[https://kafka-webhook-eventing.knative-eventing.svc:443/resource-validation?timeout=2s](https://kafka-webhook-eventing.knative-eventing.svc/resource-validation?timeout=2s)": EOF}

[pierDipi]

See knative/pkg#1509

[aliok]

/test channel-reconciler-tests-ssl_eventing-kafka-broker_release-1.2

ERROR: timeout waiting for pods to come up
strimzi-cluster-operator-76ff9bcc-2hzdj   0/1   Pending   0     5m59s