Fixes #30078 Add default_hostgroup plugin for the Katello scenario

[apatelKmd]

Based on the recommendation provided in the support communication
https://community.theforeman.org/t/default-host-group-plugin-config-file-through-the-installer/18797/2

[ehelms]

Could you please open a Redmine issue and attach it in the commit message?

[apatelKmd]

I have added the Redmine ticket number in the title https://projects.theforeman.org/issues/30078

[ehelms]

@apatelKmd Almost there! Can you edit the commit message to be the same as the title? That way when it goes into the git log it will have the right info to link it back to the Redmine issue.

[apatelKmd]

@ehelms Updated the commit message.

[ehelms]

@wbclark added some new tests here, could you help @apatelKmd with what changes are needed with this PR and the new tests?

[ekohl]

This whole change is not needed since it's already present:

foreman-installer/config/foreman-answers.yaml

Line 33 in 2cfd052

foreman::plugin::default_hostgroup: false

foreman-installer/config/katello-answers.yaml

Line 50 in 2cfd052

foreman::plugin::default_hostgroup: false

Looks like this was done prior to the installer merge so somewhere before 1.21 and my instructions on Discourse were incorrect.

https://github.com/theforeman/puppet-foreman/blob/master/manifests/plugin/default_hostgroup.pp would need to be modified to manage the config file. theforeman/puppet-foreman#601 is a similar PR that could serve as inspiration.

My apologies for misleading here.