Revert "cluster.go: Disable Southbound DB conditional monitoring."

[pecameron]

This reverts commit 799df52.

[pecameron]

@dcbw @danwinship PTAL

[danwinship]

@dcbw knows the details of what we're doing here so I'll defer to him.

If the upstream code fails with some versions of OVN though should we revert/fix it upstream?

[pecameron]

/retest

[dcbw]

/lgtm

[openshift-ci-robot]

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@pecameron: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-gcp-ovn	618c8ac	link	/test e2e-gcp-ovn

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[dcbw]

@pecameron can you backport for 4.5 as well please?