Fix wrong filtering of ManagedCertificate objects.

[krzykwas]

Because of a bug Ingress adds all ManagedCertificate objects in the cluster to the load balancer if managed-certificates annotation is not empty. Instead it should only add the objects found in the annotation. This PR fixes this bug.

/assign @rramkumar1

[k8s-ci-robot]

Hi @krzykwas. Thanks for your PR.

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[rramkumar1]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: krzykwas, rramkumar1

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[rramkumar1]

/ok-to-test