Fixes #21701 - fix loading of FilterRuleHelpers

[evgeni]

fixes:

/home/remote/egolov/Devel/katello/hammer-cli-katello/test/functional/filter_rule/update_test.rb:7:in `block in <module:HammerCLIKatello>': uninitialized constant HammerCLIKatello::FilterRuleHelpers (NameError)
Did you mean?  HammerCLIKatello::FilterRule
	from /home/remote/egolov/.gem/ruby/2.4.0/gems/minitest-4.7.4/lib/minitest/spec.rb:71:in `class_eval'
	from /home/remote/egolov/.gem/ruby/2.4.0/gems/minitest-4.7.4/lib/minitest/spec.rb:71:in `describe'
	from /home/remote/egolov/Devel/katello/hammer-cli-katello/test/functional/filter_rule/update_test.rb:6:in `<module:HammerCLIKatello>'
	from /home/remote/egolov/Devel/katello/hammer-cli-katello/test/functional/filter_rule/update_test.rb:5:in `<top (required)>'
	from /home/remote/egolov/.gem/ruby/2.4.0/gems/rake-10.1.1/lib/rake/rake_test_loader.rb:15:in `require'
	from /home/remote/egolov/.gem/ruby/2.4.0/gems/rake-10.1.1/lib/rake/rake_test_loader.rb:15:in `block in <main>'
	from /home/remote/egolov/.gem/ruby/2.4.0/gems/rake-10.1.1/lib/rake/rake_test_loader.rb:4:in `select'
	from /home/remote/egolov/.gem/ruby/2.4.0/gems/rake-10.1.1/lib/rake/rake_test_loader.rb:4:in `<main>'
rake aborted!

@akofink can you please have a look? the changes were introduced by you originally

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[evgeni]

and no, I have no idea why this does not show up on travis.

[akofink]

Huh - I've seen this before. Maybe it's Ruby 2.4? Could you please create a redmine issue to track this change? ACK pending redmine issue.