propagate database password when init db connection

[IronPan]

/assign @neuromage

---

This change is 

[IronPan]

/assign @yaronha

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[yaronha]

/lgtm

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/lgtm

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[IronPan]

/test kubeflow-pipeline-e2e-test

[neuromage]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: neuromage

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[IronPan]

/test kubeflow-pipeline-sample-test

[IronPan]

will fix part of #1624

[IronPan]

/test kubeflow-pipeline-sample-test