Adding UDP network policies tests

[knabben]

What type of PR is this?
/kind feature
/sig network
/area testing

What this PR does / why we need it:
Adding initial UDP coverage for network policy suite test

Which issue(s) this PR fixes:

xref #97640

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

@knabben: The label(s) area/testing cannot be applied, because the repository doesn't have them

In response to this:

What type of PR is this?
/kind feature
/sig network
/area testing

What this PR does / why we need it:
Adding initial UDP coverage for network policy suite test

Which issue(s) this PR fixes:

xref #97640

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

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[k8s-ci-robot]

@knabben: This issue is currently awaiting triage.

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[knabben]

Jan 31 17:28:12.706: INFO: Validation of udp-network-policy-6455-z/c -> udp-network-policy-6455-x/a FAILED !!!
Jan 31 17:28:12.706: INFO: error <nil> 
Jan 31 17:28:12.706: INFO: Expected blocked pod connection was instead ALLOWED --- run 'kubectl exec c -c cont-81-udp -n udp-network-policy-6455-z -- nc -v -z -w 1 -u s-udp-network-policy-6455-x-a.udp-network-policy-6455-x.svc.cluster.local 81'

netcat (OpenBSD netcat (Debian patchlevel 1.130)) is exiting with status 0, even when the connection is not really made on UDP.

Not existent port UDP 1404 test with a manual test from the agnhost container:

bash-5.0# nc -v -w 1 -u s-udp-network-policy-529-x-a.udp-network-policy-529-x.svc.cluster.local 1404
Connection to s-udp-network-policy-529-x-a.udp-network-policy-529-x.svc.cluster.local 1404 port [udp/*] succeeded!
bash-5.0# echo $?
0

[knabben]

Swapping the nc to agnhost connect with UDP after #98639 arrives.

[knabben]

/retest

[jayunit100]

YAYYYyyy UDP netpol tests THANK YOU ~!
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• test/e2e/network/netpol/OWNERS [jayunit100,knabben]

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[knabben]

/retest