Introduce IP_FAMILIES for integration tests

[kfaseela]

Needed for istio/istio#54421

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[kfaseela]

cc @sridhargaddam @bleggett

[bleggett]

LGTM.

[istio-testing]

@kfaseela: Updated the job-config configmap in namespace default at cluster default using the following files:

• key istio-private.istio.io.master.gen.yaml using file prow/cluster/jobs/istio-private/istio.io/istio-private.istio.io.master.gen.yaml
• key istio-private.istio.master.gen.yaml using file prow/cluster/jobs/istio-private/istio/istio-private.istio.master.gen.yaml
• key istio.istio.io.master.gen.yaml using file prow/cluster/jobs/istio/istio.io/istio.istio.io.master.gen.yaml
• key istio.istio.master.gen.yaml using file prow/cluster/jobs/istio/istio/istio.istio.master.gen.yaml
• key istio.istioexperimental.gen.yaml using file prow/cluster/jobs/istio/istio/istio.istioexperimental.gen.yaml

In response to this:

Needed for istio/istio#54421

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