[release-4.18] DNM: fix update domain count

[damdo]

Manual backport of #170

[openshift-ci]

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[openshift-ci]

@damdo: 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/okd-scos-e2e-aws-ovn	879b013	link	false	/test okd-scos-e2e-aws-ovn

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[damdo]

The ARO team is currently testing this out @Tof1973 @tiguelu