Add g+w /etc/passwd to be able to collect proxy access logs in teardown

[ewolinetz]

Similar to openshift/origin#22592

Addresses being able to add a user entry for container user id to be able to ssh to squid proxy

Agent pid 90
Identity added: /etc/openshift-installer/ssh-privatekey (/etc/openshift-installer/ssh-privatekey)
No user exists for uid 1451760000

[jcpowermac]

/lgtm

[ewolinetz]

/retest

[abhinavdahiya]

/cc @sdodson

[wking]

/lgtm

This shares the "container is only used briefly for CI" mitigation, and Scott's off today.

[openshift-ci-robot]

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