Fixes #28299 - enable rubocop-rails properly

[lzap]

I've noticed that there is a warning message, this is the way how Rubocop Rails should be included.

[theforeman-bot]

Issues: #28299

[lzap]

Test failure irrelevant, @timogoebel I actually implemented what we've talked about yesterday :-)

[lzap]

This weird error I don't see locally:

SystemStackError: stack level too deep
    test/unit/foreman/http_proxy_test.rb:120:in `block (2 levels) in <class:HTTPProxyTest>'
    test/test_helper.rb:68:in `before_setup' (SystemStackError)
/usr/local/rvm/gems/ruby-2.5.1@foreman_discovery-pull-request-2/gems/excon-0.70.0/lib/excon/connection.rb:369    

Any idea? What's this.

[timogoebel]

Might be two gems that extend excon. One might use alias_method_chain and the other one Module.prepend. Just a thought, haven't verified this.

[lzap]

Let's rebase and cross fingers.

[ezr-ondrej]

see #498 we're on 0.80 now and it seems we are not testing any of the .rb files

[lzap]

Closing in fav of #498