New db log schema

[YujiOshima]

Store all metrics of logs in DB.

/assign @gaocegege

Signed-off-by: YujiOshima yuji.oshima0x3fd@gmail.com

[k8s-ci-robot]

@YujiOshima: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
kubeflow-hp-tuning-presubmit	841f66a	link	/test kubeflow-hp-tuning-presubmit

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[gaocegege]

/lgtm

[k8s-ci-robot]

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