fixes #23676 - port robottelo CV tests

[pondrejk]

Port robottelo tier1 api tests for content views
part of robottelo minitest port project: https://github.com/SatelliteQE/robottelo/projects/1

Related Robottelo issue:

SatelliteQE/robottelo#5843

rake test:katello TEST=../katello/test/models/content_view_test.rb 
 
# Running:

.S.........S.........S...S................S...

Finished in 17.613607s, 2.6116 runs/s, 6.3019 assertions/s.
46 runs, 111 assertions, 0 failures, 0 errors, 5 skips

rake test:katello TEST=../katello/test/controllers/api/v2/content_views_controller_test.rb TESTOPTS="-ntest-update"

# Running:

.................................

Finished in 28.965637s, 1.1393 runs/s, 4.8678 assertions/s.
33 runs, 141 assertions, 0 failures, 0 errors, 0 skips

[theforeman-bot]

Do not merge! This patch has not been tested yet.

Can an existing organization member please verify this patch?

[theforeman-bot]

Issues: #23676

[beav]

ACK, thanks @pondrejk