Create Credentials Secret

[razo7]

Why we need this PR

• Don't use plaintext credentials from CR spec and fetch the credentials from a known secret name

Changes made

Which issue(s) this PR fixes

Test plan

[openshift-ci]

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You can still manually trigger a test run with /test all

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: razo7

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[razo7]

/test 4.15-openshift-e2e

[openshift-ci]

@razo7: 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/4.15-openshift-e2e	38faff0	link	true	/test 4.15-openshift-e2e

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