Add first upgrade test with DNS usage in cluster file and correct statement about DNS

[johscheuer]

Description

Fixes: #1439
Fixes: #1571

Type of change

Please select one of the options below.

• Other

Discussion

Testing

e2e tests will be running by CI.

Documentation

Updated.

Follow-up

[foundationdb-ci]

Result of fdb-kubernetes-operator-pr on Linux CentOS 7

• Commit ID: d49db65
• Duration 3:05:40
• Result: ❌ FAILED
• Error: Error while executing command: if $fail_test; then exit 1; fi. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of fdb-kubernetes-operator-pr on Linux CentOS 7

• Commit ID: b5b4b0e
• Duration 2:47:06
• Result: ❌ FAILED
• Error: Error while executing command: if $fail_test; then exit 1; fi. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[foundationdb-ci]

Result of fdb-kubernetes-operator-pr on Linux CentOS 7

• Commit ID: a9b62c4
• Duration 2:53:48
• Result: ❌ FAILED
• Error: Error while executing command: if $fail_test; then exit 1; fi. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

[johscheuer]

Result of fdb-kubernetes-operator-pr on Linux CentOS 7

• Commit ID: a9b62c4
• Duration 2:53:48
• Result: ❌ FAILED
• Error: Error while executing command: if $fail_test; then exit 1; fi. Reason: exit status 1
• Build Log terminal output (available for 30 days)
• Build Workspace zip file of the working directory (available for 30 days)

  [FAILED] in [It] - /codebuild/output/src3853236850/src/github.com/FoundationDB/fdb-kubernetes-operator/e2e/test_operator_upgrades_variations/operator_upgrades_variations_test.go:193 @ 09/29/23 17:16:50.428
  2023/09/29 17:17:05 finished all tests, start deleting namespace pr-426-edbfjpb6
• [FAILED] [457.078 seconds]
Operator Upgrades with locality based exclusions [It] Upgrade from 7.1.37 to 7.3.15 [e2e, pr]
/codebuild/output/src3853236850/src/github.com/FoundationDB/fdb-kubernetes-operator/e2e/fixtures/upgrade_test_configuration.go:105

  [FAILED] Expected
      <bool>: false
  to be true
  In [It] at: /codebuild/output/src3853236850/src/github.com/FoundationDB/fdb-kubernetes-operator/e2e/test_operator_upgrades_variations/operator_upgrades_variations_test.go:193 @ 09/29/23 17:16:50.428
------------------------------

and

• [FAILED] [1490.212 seconds]
Operator Upgrades upgrading a cluster with a crash looping sidecar process [It] Upgrade from 7.1.37 to 7.3.15 with crash-looping sidecar [e2e, pr]
/codebuild/output/src3853236850/src/github.com/FoundationDB/fdb-kubernetes-operator/e2e/fixtures/upgrade_test_configuration.go:105

  [FAILED] Unexpected error:
      <*errors.errorString | 0xc000333b10>: 
      timed out waiting for the condition
      {
          s: "timed out waiting for the condition",
      }
  occurred
  In [It] at: /codebuild/output/src3853236850/src/github.com/FoundationDB/fdb-kubernetes-operator/e2e/fixtures/fdb_cluster.go:1315 @ 09/29/23 16:57:27.378
------------------------------

We have to review those test failures in another issue/PR.