Adding diffutils to the image

[bradmwilliams]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bradmwilliams

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[openshift-ci]

@bradmwilliams: 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/ansible-module	7ccfda9	link	true	/test ansible-module

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