USHIFT-1327: correct instructions for using ssh-agent with RF tests

[dhellmann]

/assign @ggiguash

[openshift-ci-robot]

@dhellmann: This pull request references USHIFT-1327 which is a valid jira issue.

In response to this:

/assign @ggiguash

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[ggiguash]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dhellmann, ggiguash

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[openshift-ci]

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