Fix velero secret

[inbharajmani]

#4183

Above PR broke e2e, since the secret was added without base64 encoding

[openshift-ci]

@inbharajmani: The following test 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-parallel	f357ca7	link	true	/test e2e-parallel

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[geoberle]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: geoberle, inbharajmani

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[geoberle]

merged manually without tide to fix CI. basically all E2E tests were failing