Several ContentView test fixes

[vsedmik]

Problem Statement

Several CV tests are failing for various reasons:

1. Ostree cases used to be skipped since hooked on a CLOSED_WONT_FIX BZ. The skip_if_open has been removed here
2. Repo removal test cases are failing for a long time with key error since the file-repositories nor yum-repositories are returned by hammer if there are no repos to be listed.
3. sat.cli.version_incremental_update(output_format='csv') does not return anything when CSV format is requested since there is nothing to be listed in that format.
4. CV versions listing changed. There was an old sorting issue which was fixed but affected test cases were not.

Solution

1. I had to choose if to stub or remove the Ostree cases. Decided to stub them since there still is some support for them in upstream.
2. Just assert the fields are not listed after repo removal.
3. Decided to default to the base output format since that returns at least the CV version. The assertion in test_positive_inc_update_no_lce was done above an empty list, that's why it passed anyway.
4. Use sorted to get the latest CV version.

PRT test Cases example

trigger: test-robottelo
pytest: tests/foreman/cli/test_contentview.py -k 'rh_content_removed or file_repo_removal or e_inc_update'

trigger: test-robottelo
pytest: tests/foreman/cli/test_docker.py -k name_change_after_promotion

[vsedmik]

trigger: test-robottelo
pytest: tests/foreman/cli/test_contentview.py -k 'rh_content_removed or file_repo_removal or e_inc_update'

[Satellite-QE]

PRT Result

Build Number: 8789
Build Status: SUCCESS
PRT Comment: pytest tests/foreman/cli/test_contentview.py -k rh_content_removed or file_repo_removal or e_inc_update --external-logging
Test Result : ========= 4 passed, 114 deselected, 147 warnings in 800.90s (0:13:20) ==========

[vsedmik]

trigger: test-robottelo
pytest: tests/foreman/cli/test_docker.py -k name_change_after_promotion

[Satellite-QE]

PRT Result

Build Number: 8793
Build Status: SUCCESS
PRT Comment: pytest tests/foreman/cli/test_docker.py -k name_change_after_promotion --external-logging
Test Result : ========== 2 passed, 48 deselected, 77 warnings in 751.20s (0:12:31) ===========