Add randomness to port selection allowing running concurrent e2e tests

[serathius]

Useful for using stress to deflake test.

cc @ahrtr @siyuanfoundation @fuweid

[siyuanfoundation]

/retest

[fuweid]

2024-08-01T20:05:59.8946831Z {"Time":"2024-08-01T20:05:59.88891373Z","Action":"output","Package":"go.etcd.io/etcd/tests/v3/e2e","Test":"TestCtlV3GetFormat","Output":"/home/runner/work/etcd/etcd/bin/etcdctl (/home/runner/work/etcd/etcd/bin/etcdctl_--endpoints=http://localhost:28121_--dial-timeout=7s_get_--write-out=protobuf_abc) (17766): \u0003abc\u0010\u0002\u0018\u0002 \u0001*\u0003123 \u0001    ctl_v3_kv_test.go:189: \n"}
2024-08-01T20:05:59.8949859Z {"Time":"2024-08-01T20:05:59.888928738Z","Action":"output","Package":"go.etcd.io/etcd/tests/v3/e2e","Test":"TestCtlV3GetFormat","Output":"        \tError Trace:\t/home/runner/work/etcd/etcd/tests/e2e/ctl_v3_kv_test.go:189\n"}
2024-08-01T20:05:59.8951807Z {"Time":"2024-08-01T20:05:59.888933046Z","Action":"output","Package":"go.etcd.io/etcd/tests/v3/e2e","Test":"TestCtlV3GetFormat","Output":"        \t            \t\t\t\t/home/runner/work/etcd/etcd/tests/e2e/ctl_v3_test.go:263\n"}
2024-08-01T20:05:59.8953847Z {"Time":"2024-08-01T20:05:59.888936332Z","Action":"output","Package":"go.etcd.io/etcd/tests/v3/e2e","Test":"TestCtlV3GetFormat","Output":"        \t            \t\t\t\t/opt/hostedtoolcache/go/1.22.5/x64/src/runtime/asm_amd64.s:1695\n"}
2024-08-01T20:05:59.8956669Z {"Time":"2024-08-01T20:05:59.888940179Z","Action":"output","Package":"go.etcd.io/etcd/tests/v3/e2e","Test":"TestCtlV3GetFormat","Output":"        \tError:      \t\"\\r\\n\\n\\x19\\bĭ\\xd4\\xf1ֹ\\xe6\\xa7\\xe7\\x01\\x10\\xec\\xbeÚ\\xef\\x9e\\xd6\\xd6n\\x18\\x02 \\x02\\x12\\x10\\r\\n\\n\\x03abc\\x10\\x02\\x18\\x02 \\x01*\\x03123 \\x01\" does not contain \"\\x17\\b\\x93\\xe7\\xf6\\x93\\xd4ņ\\xe14\\x10\\xed\"\n"}
2024-08-01T20:05:59.8959108Z {"Time":"2024-08-01T20:05:59.888950779Z","Action":"output","Package":"go.etcd.io/etcd/tests/v3/e2e","Test":"TestCtlV3GetFormat","Output":"        \tTest:       \tTestCtlV3GetFormat\n"}
2024-08-01T20:05:59.8960698Z {"Time":"2024-08-01T20:05:59.888955889Z","Action":"output","Package":"go.etcd.io/etcd/tests/v3/e2e","Test":"TestCtlV3GetFormat","Output":"    ctl_v3_test.go:264: ---testFunc logic DONE\n"}
2024-08-01T20:05:59.8962404Z {"Time":"2024-08-01T20:05:59.8889619Z","Action":"output","Package":"go.etcd.io/etcd/tests/v3/e2e","Test":"TestCtlV3GetFormat","Output":"    ctl_v3_test.go:275: closing test cluster...\n"}

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahrtr, fuweid, serathius, siyuanfoundation

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• ~~OWNERS~~ [ahrtr,serathius]

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[henrybear327]

/retest

[k8s-ci-robot]

PR needs rebase.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 0.00%. Comparing base (ca2d91c) to head (417682c). Report is 1203 commits behind head on main.

:exclamation: Current head 417682c differs from pull request most recent head 8c93f8b

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##   main   #18391   +/-   ##
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[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed after 21 days if no further activity occurs. Thank you for your contributions.

[k8s-ci-robot]

@serathius: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-etcd-e2e-386	8c93f8b8abf9dbcd75c8da41d167d12cb25cce37	link	true	/test pull-etcd-e2e-386
pull-etcd-e2e-arm64	8c93f8b8abf9dbcd75c8da41d167d12cb25cce37	link	true	/test pull-etcd-e2e-arm64
pull-etcd-e2e-amd64	8c93f8b8abf9dbcd75c8da41d167d12cb25cce37	link	true	/test pull-etcd-e2e-amd64
ci-etcd-robustness-release36-amd64	8c93f8b8abf9dbcd75c8da41d167d12cb25cce37	link	true	/test ci-etcd-robustness-release36-amd64
ci-etcd-robustness-release35-amd64	8c93f8b8abf9dbcd75c8da41d167d12cb25cce37	link	true	/test ci-etcd-robustness-release35-amd64
ci-etcd-robustness-release34-amd64	8c93f8b8abf9dbcd75c8da41d167d12cb25cce37	link	true	/test ci-etcd-robustness-release34-amd64

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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