Add missing bash options to dns/run.sh

[mm4tt]

This is, among others, to properly propagate error status.

Ref. #1586

[wojtek-t]

/lgtm
/approve

[k8s-ci-robot]

@mm4tt: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-perf-tests-benchmark-kube-dns	6312eb9	link	/test pull-perf-tests-benchmark-kube-dns

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[mm4tt]

The pull-perf-tests-benchmark-kube-dns test failed, but it's exactly what we wanted to achieve. We'll fix it later.
It's not a required presubmit so it won't block merging.

[prameshj]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mm4tt, prameshj, wojtek-t

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• dns/OWNERS [mm4tt,prameshj,wojtek-t]

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[mm4tt]

Looks like the pull-perf-tests-benchmark-kube-dns is not optional :/

I could make it optional then merge this and then make it back required. However, I'm not sure if it's worth the hassle. Let me try merging this PR with the test failing.