Fix ClusterOperator event when version changes

[jsafrane]

Don't show ugly JSON diff when only the operator version changes.

Before this PR, when only Versions changed in a ClusterOperator:

Status for clusteroperator/csi-snapshot-controller changed: {"conditions":[{"type":"Degraded","status":"False","lastTransitionTime":"2020-04-29T11:32:49Z","reason":"AsExpected"},{"type":"Progressing","status":"False","lastTransitionTime":"2020-04-29T11:34:04Z","reason":"AsExpected"},{"type":"Available","status":"True","lastTransitionTime":"2020-04-29T11:34:04Z","reason":"AsExpected"},{"type":"Upgradeable","status":"True","lastTransitionTime":"2020-04-29T11:32:49Z","reason":"AsExpected"}],"

A: relatedObjects":[{"group":"","resource":"namespaces","name":"openshift-cluster-storage-operator"},{"group":"","resource":"namespaces","name":"openshift-cluster-storage-operator"},{"group":"operator.openshift.io","resource":"csisnapshotcontrollers","name":"cluster"}],"extension":null}


B: versions":[{"name":"csi-snapshot-controller","version":"v2.3.4"},{"name":"operator","version":"v1.2.3"}],"relatedObjects":[{"group":"","resource":"namespaces","name":"openshift-cluster-storage-operator"},{"group":"","resource":"namespaces","name":"openshift-cluster-storage-operator"},{"group":"operator.openshift.io","resource":"csisnapshotcontrollers","name":"cluster"}],"extension":null}

With this PR:
Status for clusteroperator/csi-snapshot-controller changed: status.versions changed from [] to [{"operator" "v1.2.3"} {"csi-snapshot-controller" "v2.3.4"}]

Related to https://bugzilla.redhat.com/show_bug.cgi?id=1829320

[mfojtik]

/lgtm

[deads2k]

/approve

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deads2k, jsafrane, mfojtik

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