Allow specifying additional result outcomes in openshift template.
    
    This can be used like this:
    
        $ oc process --local -f ./openshift/resultsdb-test-template.yaml \
            -p TEST_ID=test \
            -p RESULTSDB_ADDITIONAL_RESULT_OUTCOMES=\[\'SOMETHING\'\]
    
    In particular, it will be used by the Greenwave test suite which expects to be
    able to run some tests against resultsdb with varying kinds of outcomes.