QE: Fix server restart via SSH

[nodeg]

add description

This fixes some of the 4.3 CI issues found by @mcalmer which are leftovers from the Twopence lazy init backport. See https://github.com/SUSE/spacewalk/pull/22269

Twopence uses the following init, so the hostname rename and SSH reboot tests could be a bit simplified because we know what the server target is already and do not have to use its IP address:

GUI diff

No difference.

• DONE

Documentation

• No documentation needed: only internal and user invisible changes

• DONE

Test coverage

• Cucumber tests were added

• DONE

Links

Port of https://github.com/SUSE/spacewalk/pull/22313

• DONE

Changelogs

Make sure the changelogs entries you are adding are compliant with https://github.com/uyuni-project/uyuni/wiki/Contributing#changelogs and https://github.com/uyuni-project/uyuni/wiki/Contributing#uyuni-projectuyuni-repository

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[nodeg]

I have no idea why RuboCop suddenly complains about code I did not touch in this PR.

Run cd testsuite
Inspecting 40 files
....................C...................

Offenses:

features/support/constants.rb:201:[10](https://github.com/uyuni-project/uyuni/actions/runs/5866356247/job/15905013667?pr=7417#step:5:11): C: Style/StringLiterals: Prefer single-quoted strings when you don't need string interpolation or special symbols.
  if ENV["PROVIDER"].include? 'podman'
         ^^^^^^^^^^

40 files inspected, 1 offense detected
Error: Process completed with exit code 1.

Nevertheless, I fixed it with an additional commit.

[Bischoff]

Nice catches.

See documentation nitpicks.

[Bischoff]

nice catch

[nodeg]

The one failing test is a flaky one.