Always set LastTransitionTime in OperatorStatusCondition

[soltysh]

This PR is fixing the problem spotted in openshift/cluster-version-operator#168:

Unable to update cluster operator status: ClusterOperator.config.openshift.io \"operator-lifecycle-manager\" is invalid: []: Invalid value: map[string]interface {}{\"kind\":\"ClusterOperator\", \"metadata\":map[string]interface {}{\"uid\":\"a694fc84-68d4-11e9-a00d-125e210e6730\", \"generation\":1, \"creationTimestamp\":\"2019-04-27T10:10:14Z\", \"resourceVersion\":\"4564\", \"name\":\"operator-lifecycle-manager\"}, \"spec\":map[string]interface {}{}, \"apiVersion\":\"config.openshift.io/v1\", \"status\":map[string]interface {}{\"extension\":interface {}(nil), \"conditions\":[]interface {}{map[string]interface {}{\"type\":\"Degraded\", \"status\":\"False\", \"lastTransitionTime\":\"2019-04-27T10:10:14Z\"}, map[string]interface {}{\"message\":\"Deployed 0.9.0\", \"type\":\"Progressing\", \"status\":\"True\", \"lastTransitionTime\":interface {}(nil)}, map[string]interface {}{\"type\":\"Available\", \"status\":\"True\", \"lastTransitionTime\":\"2019-04-27T10:10:14Z\"}}, \"versions\":[]interface {}{map[string]interface {}{\"version\":\"0.0.1-2019-04-27-095238\", \"name\":\"operator\"}, map[string]interface {}{\"name\":\"operator-lifecycle-manager\", \"version\":\"0.9.0\"}}}}: validation failure list:\nstatus.conditions.lastTransitionTime in body must be of type string: \"null\""

/assign @ecordell

[soltysh]

/retest

[ecordell]

/lgtm

[ecordell]

/approve

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ecordell, soltysh

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[ecordell]

/test e2e-aws-olm

[ecordell]

/retest

[ecordell]

/retest

[ecordell]

/retest