e2e tests: dump ip information for each VM

[justinsb]

Add this to the data we dump.

[k8s-ci-robot]

@justinsb: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-kubernetes-e2e-ubuntu-gce-build	311c411	link	false	/test pull-kops-kubernetes-e2e-ubuntu-gce-build

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hakman

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