remove unnecessary global modification from upgrade

[deads2k]

Only the actual run test needs to set the global.

[neisw]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deads2k, neisw

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[openshift-trt-bot]

Job Failure Risk Analysis for sha: bb2fa9d

Job Name	Failure Risk
pull-ci-openshift-origin-master-e2e-aws-ovn-upgrade	High Cluster upgrade.[sig-apps] job-upgrade This test has passed 100.00% of 62 runs on jobs ['periodic-ci-openshift-release-master-ci-4.14-e2e-aws-ovn-upgrade'] in the last 14 days.
pull-ci-openshift-origin-master-e2e-aws-ovn-single-node-serial	High [sig-api-machinery] Namespaces [Serial] should always delete fast (ALL of 100 namespaces in 150 seconds) [Feature:ComprehensiveNamespaceDraining] [Suite:openshift/conformance/serial] [Suite:k8s] This test has passed 100.00% of 35 runs on jobs ['periodic-ci-openshift-release-master-nightly-4.14-e2e-aws-ovn-single-node-serial'] in the last 14 days.
pull-ci-openshift-origin-master-e2e-aws-ovn-single-node	Medium [sig-arch][Late] operators should not create watch channels very often [apigroup:apiserver.openshift.io] [Suite:openshift/conformance/parallel] This test has passed 96.88% of 32 runs on jobs ['periodic-ci-openshift-release-master-nightly-4.14-e2e-aws-ovn-single-node'] in the last 14 days.

[openshift-ci]

@deads2k: The following tests 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/e2e-aws-ovn-single-node-serial	bb2fa9d	link	false	/test e2e-aws-ovn-single-node-serial
ci/prow/e2e-aws-ovn-upgrade	bb2fa9d	link	false	/test e2e-aws-ovn-upgrade
ci/prow/e2e-aws-ovn-single-node	bb2fa9d	link	false	/test e2e-aws-ovn-single-node

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