USHIFT-4541: improve slave NIC detection for router exposed IPs

[pacevedom]

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[openshift-ci-robot]

@pacevedom: This pull request references USHIFT-4541 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.18.0" version, but no target version was set.

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[pacevedom]

/retest-required

[jerpeter1]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jerpeter1, pacevedom

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD f6912bf and 2 for PR HEAD 86f10f2 in total

[openshift-ci]

@pacevedom: all tests passed!

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