avoid hostNetwork pods conflict binding UDP ports

[aojea]

The agnhost pods using netexec will bind by default to the UDP
port 8081, use a different port for hostNetwork pods to avoid
scheduling conflicts and fail the tests.

After #105143 we can completely disable UDP for this test, by setting the UDP port to -1, but in the meantime this will solve some of the flakiness, since this test was binding to UDP port 8081 and failing because of the port conflict as reported in slack https://kubernetes.slack.com/archives/C09QZ4DQB/p1631869484079100

/kind failing-test
/kind flake

NONE

[k8s-ci-robot]

@aojea: This issue is currently awaiting triage.

If a SIG or subproject determines this is a relevant issue, they will accept it by applying the triage/accepted label and provide further guidance.

The triage/accepted label can be added by org members by writing /triage accepted in a comment.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[aojea]

/assign @MrHohn @andrewsykim @uablrek

[aojea]

/sig network

[uablrek]

/lgtm

Without this PR the echo-hostname-0 restarted about 5 times and at least some test failed. With this PR applied I have not got any similar failures.

[MrHohn]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, MrHohn

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• test/e2e/network/OWNERS [MrHohn,aojea]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[k8s-triage-robot]

The Kubernetes project has merge-blocking tests that are currently too flaky to consistently pass.

This bot retests PRs for certain kubernetes repos according to the following rules:

• The PR does have any do-not-merge/* labels
• The PR does not have the needs-ok-to-test label
• The PR is mergeable (does not have a needs-rebase label)
• The PR is approved (has cncf-cla: yes, lgtm, approved labels)
• The PR is failing tests required for merge

You can:

• Review the full test history for this PR
• Prevent this bot from retesting with /lgtm cancel or /hold
• Help make our tests less flaky by following our Flaky Tests Guide

/retest