[release-4.14] Enforcing the serial execution of the integration tests

[openshift-cherrypick-robot]

This is an automated cherry-pick of #7591

/assign zaneb

[zaneb]

/lgtm
/backport-risk-assessed

[bfournie]

/approve

[zaneb]

/test agent-integration-tests

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bfournie

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[zaneb]

/label backport-risk-assessed

[zaneb]

Adding labels manually, as this only affects the CI tests.

[openshift-ci]

@openshift-cherrypick-robot: 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/okd-scos-e2e-vsphere	410a396	link	false	/test okd-scos-e2e-vsphere
ci/prow/okd-scos-e2e-gcp-ovn-upgrade	410a396	link	false	/test okd-scos-e2e-gcp-ovn-upgrade
ci/prow/okd-scos-e2e-gcp	410a396	link	false	/test okd-scos-e2e-gcp

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