[release-v1.17] Better error message for s2i calls

[matejvasek]

picking knative#3185

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matejvasek

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[openshift-ci]

@matejvasek: 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
ci/prow/420-e2e-oncluster-test	e054227	link	true	/test 420-e2e-oncluster-test

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[matejvasek]

PTAL @jrangelramos @lkingland @gauron99
note the failing tests have nothing to do with PR.

[jrangelramos]

lgtm