Updating ose-egress-http-proxy builder & base images to be consistent with ART

[jupierce]

Updating ose-egress-http-proxy builder & base images to be consistent with ART
Reconciling with https://github.com/openshift/ocp-build-data/tree/f66c03011773dc3755ad874fc691be612914d65f/images/ose-egress-http-proxy.yml

If you have any questions about this pull request, please reach out to @art-team in the #aos-art coreos slack channel.

Depends on #44 . Allow it to merge and then run /test all on this PR.

[openshift-ci-robot]

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[jupierce]

/retest

[openshift-ci-robot]

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

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws	6369107	link	/test e2e-aws

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[jupierce]

/retest