Use Hammer CLI in favor of WebUI to change setting

[maximiliankolb]

What changes are you introducing?

Replace step that uses Web UI with Hammer CLI command.

Why are you introducing these changes? (Explanation, links to references, issues, etc.)

All steps but one relies on using CLI, so we should not force the user to complete this single step via WebUI.

Anything else to add? (Considerations, potential downsides, alternative solutions you have explored, etc.)

Tested on Foreman 3.14/Katello 4.16.

Contributor checklists

• I am okay with my commits getting squashed when you merge this PR.
• I am familiar with the contributing guidelines.

Please cherry-pick my commits into:

• Foreman 3.16/Katello 4.18 (Satellite 6.18)
• Foreman 3.15/Katello 4.17
• Foreman 3.14/Katello 4.16 (Satellite 6.17; orcharhino 7.4)
• Foreman 3.13/Katello 4.15 (EL9 only)
• Foreman 3.12/Katello 4.14 (Satellite 6.16; orcharhino 7.2 on EL9 only; orcharhino 7.3)
• Foreman 3.11/Katello 4.13 (orcharhino 6.11 on EL8 only; orcharhino 7.0 on EL8+EL9; orcharhino 7.1 with Leapp)
• Foreman 3.10/Katello 4.12
• Foreman 3.9/Katello 4.11 (Satellite 6.15; orcharhino 6.8/6.9/6.10)
• We do not accept PRs for Foreman older than 3.9.

Review checklists

Tech review (performed by an Engineer who did not author the PR; can be skipped if tech review is unnecessary):

• The PR documents a recommended, user-friendly path.
• The PR removes steps that have been made unnecessary or obsolete.
• Any steps introduced or updated in the PR have been tested to confirm that they lead to the documented end result.

Style review (by a Technical Writer who did not author the PR):

• The PR conforms with the team's style guidelines.
• The PR introduces documentation that describes a user story rather than a product feature.

[github-actions]

The PR preview for e511c08 is available at theforeman-foreman-documentation-preview-pr-4249.surge.sh

The following output files are affected by this PR:

• Installing_Proxy/index-katello.html
• Installing_Proxy/index-orcharhino.html
• Installing_Proxy/index-satellite.html
• Installing_Server/index-satellite.html
• Installing_Server_Disconnected/index-satellite.html

show diff

show diff as HTML

[ekohl]

I was surprised by this setting even existing and especially where it's defined. It's in Katello:

https://github.com/Katello/katello/blob/a053c92d0fa4413400d6032492fc6b90224d31f6/lib/katello/plugin.rb#L678-L682

If we tell users to set this to true, is there a good reason why it's default to false?

@adamruzicka you added the setting in Katello/katello@840cbe6. Can you shine a light on that?

[adamruzicka]

I was surprised by this setting even existing and especially where it's defined. It's in Katello

Remote execution has a mechanism for picking a proxy to be used. The mechanism takes many things into consideration and is generally not compatible with katello's "host is registered to a proxy so everything has to be done through that proxy, regardless on subnets and things like that" world view. Hence katello comes with a setting to bend the behaviour of Rex to match katello's customs.

I don't like it either, but probably for a different reason.

If we tell users to set this to true, is there a good reason why it's default to false?

Mostly to have vanilla foreman and foreman with katello behave the same way with an option to selectively enable different behaviour.