oo-diagnostics: openshift-iptables-port-proxy

test_services_enabled: Check for openshift-iptables-port-proxy instead
of openshift-port-proxy (the former supersedes the latter).
Merge pull request #3904 from Miciah/oo-diagnostics-fix-test_services_enabled-for-openshift-iptables-port-proxy

Merged by openshift-bot