Populate port mapping name to make endpoint port mapping work.

[mneverov]

What kind of PR is this?

Bug fix: previously, port name was not populated that prevented endpoint port mapping to work correctly.

Why this PR is needed / What this PR do?

This PR fix the issue above.

Which issue(s) this PR fixes?

Fixes #
Fixes tests:
should be updated after adding or deleting ports and should serve multiport endpoints from pods [Conformance] in e2e-ipv4-iptables mode.

Additional information about this PR

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[mneverov]

question: should I remove should be updated after adding or deleting ports and should serve multiport endpoints from pods [Conformance] tests from ginkgo skip lists for ipv4 and ipv6?

[jayunit100]

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jayunit100, mneverov

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[k8s-ci-robot]

PR needs rebase.

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/lifecycle stale

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[mneverov]

This change has already landed within #532.
Closing.