Test path was unintentionally broken by a refactor

[smarterclayton]

Make setting PATH consistent across everyone using the TESTS image,
and fix it so that oc is copied to the installer-e2e template correctly.

[abhinavdahiya]

/lgtm

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: abhinavdahiya, smarterclayton

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[wking]

POSIX police: we had been using which before, but command -v oc is in POSIX while which is not. Obviously both will work for our test image, and we're unlikely to drop which but thought I'd point it out just in case ;).

[openshift-ci-robot]

@smarterclayton: Updated the following 5 configmaps:

• prow-job-cluster-launch-e2e-openshift-ansible configmap using the following files:
  • key cluster-launch-e2e-openshift-ansible.yaml using file ci-operator/templates/cluster-launch-e2e-openshift-ansible.yaml
• prow-job-cluster-launch-e2e-upgrade configmap using the following files:
  • key cluster-launch-e2e-upgrade.yaml using file ci-operator/templates/cluster-launch-e2e-upgrade.yaml
• prow-job-cluster-launch-e2e configmap using the following files:
  • key cluster-launch-e2e.yaml using file ci-operator/templates/cluster-launch-e2e.yaml
• prow-job-cluster-launch-src configmap using the following files:
  • key cluster-launch-src.yaml using file ci-operator/templates/cluster-launch-src.yaml
• prow-job-cluster-launch-installer-e2e configmap using the following files:
  • key cluster-launch-installer-e2e.yaml using file ci-operator/templates/openshift/installer/cluster-launch-installer-e2e.yaml

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In response to this:

Make setting PATH consistent across everyone using the TESTS image,
and fix it so that oc is copied to the installer-e2e template correctly.

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